ipv6 assignment command

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How do I assign IPv6 addresses manually?

So I'm still rather clueless with IPv6, but I wanted to try something with my network today. Currently, I assign IPv4 LAN addresses manually, so that my router is 192.168.0.1 , then my first computer is 192.168.0.2 , and so on.

So far, I haven't been able to figure out how to do this with IPv6. Or is the process completely different that this is not how it would work?

Router is an Archer C4000, and my main system runs Ubuntu 19.04

EDIT: To clarify with how I manually set network IP addresses, my router has a page where I can set an address of my choosing to a MAC address. No configuration is done outside of the router.

Please edit question and indicate how you assign LAN addesses manually. (On the router only? On your first computer as well?) I suspect you just set a network range on the router, and then addresses are not assigned "manually", but by DHCP from the router. On IPv6 then your router needs to advertise a subnet. On Ubuntu, you can set both IPv4 and IPv6 address manually with ip addr add ... . – dirkt Sep 10, 2019 at 11:22
Edited. I'm going to guess then that it is assigned from a range, but then I limit what can be assigned based on MAC addresses. If I'm setting the IP address manually on each device, is there any further configuration that needs to be done (apart from avoiding duplicates), or will the router just accept that device A is going to use its own configured address? – hiigaran Sep 10, 2019 at 12:00
If there's a page where you can assign an IPv4 address based on a MAC address, then this is for static addresses assigned via DHCP from the router. IPv6 works differently. While there is DHCPv6, the normal way is to use SLAAC , and let each computer pick an IPv6 address based on the announced subnet prefix.So this page won't help you to assign IPv6 addresses... – dirkt Sep 10, 2019 at 12:05

2 Answers 2

To clarify with how I manually set network IP addresses, my router has a page where I can set an address of my choosing to a MAC address. No configuration is done outside of the router

This usually isn't called "manual configuration" to avoid confusion (from the LAN hosts' point of view, it is still automatic configuration). The usual terms are "static DHCP lease" or "DHCP reservation".

Overall, the process in IPv6 is usually completely different.

In IPv6 primary address auto-configuration mechanism (SLAAC) is completely stateless: the router does not issue individual addresses; it only periodically advertises the subnet address prefix and each host just combines it with its own chosen suffix. The router cannot limit hosts to just a specific sub-range; in fact the router does not receive any feedback about hosts' chosen address at all.

(Depending on each device's OS, the suffix might be a MAC address in traditional RFC4862 SLAAC; it might be a static hash value in RFC7217; it might be completely random in RFC4941 "Privacy Extensions"; and it might even be a user-provided value if the OS allows that.)

For example, the router advertises 2001:db8:123:456::/64 as the LAN address prefix; client A combines it with its own MAC address and begins using 2001:db8:123:456:6af2:68fe:ff7c:e25c .

That said, DHCP does exist in the IPv6 world and handles address leases in much the same way as IPv4 DHCP does. That means you can create DHCPv6 address pools, you can configure static address leases in DHCPv6, and so on. But not all clients support DHCPv6 at all (e.g. Android does not), so having SLAAC alongside is almost unavoidable.

So if you have a DHCPv6-capable client on a DHCPv6-capable network, chances are it'll have both a nice DHCPv6-assigned address and a longer SLAAC-autoconfigured address.

If I'm setting the IP address manually on each device, is there any further configuration that needs to be done (apart from avoiding duplicates), or will the router just accept that device A is going to use its own configured address?

As you can see above, that's how IPv6 address configuration works anyway .

Your router's manual is found in User Guide and contains for IPv6 only an option for entering a static IPv6 address for the router itself (as received from the ISP).

The section about specifying the IP addresses that the router assigns by MAC address does not say whether they are IPv4 or IPv6, but I think it is highly unlikely that this will work for IPv6. And here is why.

IPv6 is quite unlike IPv4 in the sense that the long IPv6 address is made up of two parts. The first (the prefix) is assigned by the ISP. The second is assigned locally by the router or by each computer and is usually a random value based on the MAC address.

This means that the router does not control the IPv6 prefix which the ISP can change whenever it likes. You can force your computer to use a static IPv6 address, but only if it agrees with the ISP. You may be able to ask the ISP for a static IPv6 address, but that is a bad idea.

The reason it's a bad idea, is that all your devices are visible to the entire Internet by their IPv6 address (unless the router intervenes). Therefore having a fixed IPv6 address just makes tracking you that much easier.

If you wish, you would in Windows set a computer's static IPv6 inside Start > Network > Network and Sharing Center > Change Adapter Setting , right-click on the Ethernet connection IPv6 and choose Properties, right-click "Internet Protocol Version 6 (TCP/IPv6)" and click on Properties, the set "Use the following IPv6 address".

But the fact you can does not mean you should. The only place that static IPv6 addresses makes sense is inside a local network which is not connected to the Internet.

What about if I wanted to run a web server? I'm constantly traveling for work, and I would love to have access to one of the computers at home which runs 24/7. I'd need to set a static IPv6 for this to work, wouldn't I? – hiigaran Sep 10, 2019 at 19:23
A general solution would require an IPv6 dynamic DNS provider. See for that the article dynv6.com: IPv6 dynamic DNS done right . – harrymc Sep 10, 2019 at 19:29
@harrymc Help me understand your logic, why would a server in a data center have a static IP but a server at home a dynamic one? In what world does that make any sense? – Chazy Chaz Jul 29, 2022 at 12:40
In a world where the ISP attributes to users dynamic IP addresses. – harrymc Jul 29, 2022 at 12:51

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Stateless autoconfiguration for IPv6

Stateless autoconfiguration for IPv6 is like a “mini-DHCP” server for IPv6. Routers running IPv6 can give the prefix of the network and a gateway address to clients looking for an IPv6 address. IPv6 uses the NDP (Neighbor Discovery Protocol), and one of the things this protocol offers is RS (Route Solicitation and (RA) Router Advertisement messages that help an IPv6 device configure an IPv6 address automatically. Let’s take a look at a configuration example:

Besides configuring an IPv6 address, we must use the ipv6 unicast-routing command to make R2 act like a router. Remember this command since you need it for routing protocols as well.

We need to enable ipv6 address autoconfig on R1 to make sure it generates its own IPv6 address.

We can use debug ipv6 nd to watch the whole process.

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Forum Replies

Good article…

Making it a little more comprehensive will make it a lot better and one of the best learning source especially for starters.

Thanks. I’ll add some more IPv6 stuff in the feature, especially since the new CCNA exams cover much more IPv6 then the previous version.

good article. But I could not get ipv6 address from my neighbor router in gns3 ((

Did you enable the interfaces? It worked fine on a couple of 3600 routers in GNS3.

it works for me. using 7200

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IPv6 Configuration on Cisco Packet Tracer

Table of Contents

IPv6 Configuration

IPv6 is the new version of the most important Network Layer Protocol IP. With this new IP version, IPv6, beside different features, some configuration differencies are also coming. In this lesson, we will focus on these IPv6 Configuration Steps, IPv6 Configuration on Cisco devices . We will use the below Packet Tracer topology for our IPv6 Config .

You can download Packet Tracer IPv6 Lab , in Packet Tracer Labs page.

In this configuration lesson, we will follow the below IPv6 Configuration steps :

Enable IPv6 Globally

Enable ipv6 on interface, configure eui-64 format global unicast address, configure manual global unicast address, manual link local address configuration, auto ipv6 address configuration, enable dhcpv6 client, ipv6 verification commands.

So, let’s go to the IPv6 Configuration steps and configure IPv6 for Cisco routers .

After going to the configuration mode with “ configure terminal ” command, to enable IPv6 on a Cisco router, “ ipv6 unicast-routing ” command is used. With this Cisco command, IPv6 is enabled globally on the router. This can be used before both interface configurations and IPv6 Routing Protocol configurations.

Router 1# configure terminal Router 1(config)# ipv6 unicast-routing Router 2# configure terminal Router 2(config)# ipv6 unicast-routing

After enabling IPv6 globally, we should enable IPv6 under the Interfaces. To enable IPv6 under an interface, we will use “ ipv6 enable ” command. Let’s enable IPv6 on two interfaces of each router.

Router 1 (config)# interface FastEthernet0/0 Router 1 (config-if)# ipv6 enable Router 1 (config-if)# no shutdown Router 1 (config)# interface FastEthernet0/1 Router 1 (config-if)# ipv6 enable Router 1 (config-if)# no shutdown

Router 2 (config)# interface FastEthernet0/0 Router 2 (config-if)# ipv6 enable Router 2 (config-if)# no shutdown Router 2 (config)# interface FastEthernet0/1 Router 2 (config-if)# ipv6 enable Router 2 (config-if)# no shutdown

EUI-64 format is the IPv6 format used to create IPv6 Global Unicast Addresses . It is a specific format that we have also talked about before. With this format, basically, interface id of the whole IPv6 adderess is ceated with the help of the MAC address. After that, this created interface id is appended to the network id.

To configure an interface with EUI-64 format (Extended Unique Identifier), firstly we will go under the interface, then we will use “ ip address ipv6-address/prefix-length eui-64 ” command. Here, our IPv6 address and prefix-length are 2001:AAAA:BBBB:CCCC::/64. The real EUI-64 Global Unicast Address will be created with this address and MAC address after IPv6 configuration.

Router 1 (config)# interface FastEthernet0/0 Router 1(config-if)# ipv6 address 2001:AAAA:BBBB:CCCC::/64 eui-64 Router 1(config-if)# end

Let’s check the IPv6 address that is created with EUI-64 format with “ show ipv6 interface brief ” command.

Router 1# show ipv6 interface brief FastEthernet0/0 [up/up] FE80::2E0:B0FF:FE0E:7701 2001:AAAA:BBBB:CCCC:2E0:B0FF:FE0E:7701 FastEthernet0/1 [up/up] FE80::2E0:B0FF:FE0E:7702 Vlan1 [administratively down/down] unassigned

If we do not use EUI-64 format address, we have to write the whole IPv6 Address to the configuration line. Let’s configure Gigabit Ethernet 0/0 interface of Router 2 manually .

Router 2 (config)# interface FastEthernet0/0 Router 2 (config-if)# ipv6 address 2001:AAAA:BBBB:CCCC:1234:1234:1234:1234/64 Router 2(config-if)# end

Here, both of these directly connected interfaces are in the same subnet, the Network ID is same (2001:AAAA:BBBB:CCCC::/64).

Let’s check the IPv6 address that we have manually assigned with “ show ipv6 interface brief ” command.

Router 2# show ipv6 interface brief FastEthernet0/0 [up/up] FE80::206:2AFF:FE15:BD01 2001:AAAA:BBBB:CCCC:1234:1234:1234:1234 FastEthernet0/1 [administratively up/up] FE80::206:2AFF:FE15:BD02 Vlan1 [administratively down/down] unassigned

To check the connectivity between two node, we use ping. As IPv4, with IPv6, we also use ping, but this time it is called IPv6 Ping . The format of IPv6 Ping is a little difference than IPv4 Ping. These differences are the format of the used IP address and the used keywords. With IPv6 Ping , “ ping ipv6 ” keywords are used before the destination IPv6 address.

Here, we will ping from Router 1 GigabitEthernet0/0 interface to Router 2 GigabitEthernet0/0 interface.

Router 1# ping ipv6 2001:AAAA:BBBB:CCCC:1234:1234:1234:1234 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:AAAA:BBBB:CCCC:1234:1234:1234:1234, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/1 ms

To check the configured IPv6 Address, we can use “ show ipv6 interface interface-name ” command.

Router 1# show ipv6 interface FastEthernet0/0 FastEthernet0/0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::2E0:B0FF:FE0E:7701 No Virtual link-local address(es): Global unicast address(es): 2001:AAAA:BBBB:CCCC:2E0:B0FF:FE0E:7701 , subnet is 2001:AAAA:BBBB:CCCC::/64 [EUI] Joined group address(es): FF02::1 FF02::2 FF02::1:FF0E:7701 MTU is 1500 bytes ICMP error messages limited to one every 100 milliseconds ICMP redirects are enabled ICMP unreachables are sent ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds ND advertised reachable time is 0 (unspecified) ND advertised retransmit interval is 0 (unspecified) ND router advertisements are sent every 200 seconds ND router advertisements live for 1800 seconds ND advertised default router preference is Medium Hosts use stateless autoconfig for addresses.

Router 2# show ipv6 interface FastEthernet0/0 FastEthernet0/0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::206:2AFF:FE15:BD01 No Virtual link-local address(es): Global unicast address(es): 2001:AAAA:BBBB:CCCC:1234:1234:1234:1234 , subnet is 2001:AAAA:BBBB:CCCC::/64 Joined group address(es): FF02::1 FF02::2 FF02::1:FF15:BD01 FF02::1:FF34:1234 MTU is 1500 bytes ICMP error messages limited to one every 100 milliseconds ICMP redirects are enabled ICMP unreachables are sent ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds ND advertised reachable time is 0 (unspecified) ND advertised retransmit interval is 0 (unspecified) ND router advertisements are sent every 200 seconds ND router advertisements live for 1800 seconds ND advertised default router preference is Medium Hosts use stateless autoconfig for addresses.

Here, with ipv6 ping, there are some options that we can use. These are given below:

ping ipv6 [hostname | ip_address] [repeat repeat-count | size datagram-size | source [ interface-name | source-address ]

repeat : Ping packet count. The default ping repeat value is 5.
size : Datagram size. The default value ping size is 56 bytes.
source : Source Address of the ping. Default value is None.

So if we would like to send 10 IPv6 ping packet with 200 byte datagrams from 2001:AAAA:BBBB:CCCC:1234:1234:1234:1234 to 2001:AAAA:BBBB:CCCC:1111:2222:3333:4444, we will use the below command:

Router 2 # ping ipv6 2001:AAAA:BBBB:CCCC:1111:2222:3333:4444 repeat 10 size 200 source 2001:AAAA:BBBB:CCCC:1234:1234:1234:1234

To configure a Link Locak address manually, we use “ ipv6 address link-local ipv6-address ” command. Here, we should write an IPv6 address in the range of Link Local addresses. If you would like to learn more about a Link Local Address, you can check Link Local Address lesson.

Let’s configure GigabitEthernet0/1 interface of Router 1 with Link Local Address FE80::AAAA:BBBB:CCCC:DDDD. Here, there is no need to write a prefix length but we will add link-local keyword at the end of the command.

Router 1 (config)# interface FastEthernet0/1 Router 1 (config-if)# ipv6 address FE80::AAAA:BBBB:CCCC:DDDD link-local Router 1 (config-if)# end

Let’s check the manually configure ipv6 Link-Local address with “ show ipv6 interface brief ” command.

Router 1# show ipv6 interface brief FastEthernet0/0 [up/up] FE80::2E0:B0FF:FE0E:7701 2001:AAAA:BBBB:CCCC:2E0:B0FF:FE0E:7701 FastEthernet0/1 [administratively down/down] FE80::AAAA:BBBB:CCCC:DDDD Vlan1 [administratively down/down] unassigned

IPv6 Addresses can be configured automatically. This is one of the most important characteristics coming with IPv6. For IPv6 Auto configuration , we will use “ ipv6 address autoconfig ” command. Let’s use it on Router 2 on GigabitEthernet0/1.

Router 2 (config)# interface FastEthernet0/1 Router 2 (config-if)# ipv6 address autoconfig Router 2 (config-if)# end

This type of IPv6 address configuration is Sateless Auto Configuration .

Let’s check the Autoconfigured Link-Local ipv6 address with “ show ipv6 interface brief ” command.

Router 2# show ipv6 interface brief FastEthernet0/0 [up/up] FE80::206:2AFF:FE15:BD01 2001:AAAA:BBBB:CCCC:1234:1234:1234:1234 FastEthernet0/1 [up/down] FE80::206:2AFF:FE15:BD02 Vlan1 [administratively down/down] unassigned

Let’s ping from Router 2 to Router 1 to test this second interfaces’ ipv6 connection.

Router 2# ping ipv6 FE80::AAAA:BBBB:CCCC:DDDD Output Interface: FastEthernet0/1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to FE80::AAAA:BBBB:CCCC:DDDD, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/1 ms

To enable DHCPv6 Client function on an interface, we use “ ipv6 address dhcp ” command under this interface. With this command, interface gets its IPv6 address form the DHCPv6 server . Let’s enable DHCPv6 on GigabitEthernet0/2 of Router 2.

Router 1 (config)# interface FastEthernet0/1 Router 1 (config-if)# ipv6 address dhcp Router 1 (config)# end

To verify DHCPv6 enabled interfaces, we can use “ show ipv6 dhcp interface ” command.

Router 1 # show ipv6 dhcp interface

To verify IPv6 Configuration, we can use different show commands. These IPv6 show commands are given below

To check IPv6 interface configuration and status we use “ show ipv6 interface interface-id ”.

Router 1# show ipv6 interface FastEthernet0/0 FastEthernet0/0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::2E0:B0FF:FE0E:7701 No Virtual link-local address(es): Global unicast address(es): 2001:AAAA:BBBB:CCCC:2E0:B0FF:FE0E:7701, subnet is 2001:AAAA:BBBB:CCCC::/64 [EUI] Joined group address(es): FF02::1 FF02::2 FF02::1:FF0E:7701 MTU is 1500 bytes ICMP error messages limited to one every 100 milliseconds ICMP redirects are enabled ICMP unreachables are sent ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds ND advertised reachable time is 0 (unspecified) ND advertised retransmit interval is 0 (unspecified) ND router advertisements are sent every 200 seconds ND router advertisements live for 1800 seconds ND advertised default router preference is Medium Hosts use stateless autoconfig for addresses.

To check IPv6 neighbor cache entries we use “ show ipv6 neighbors ”.

Router 1# show ipv6 neighbors IPv6 Address Age Link-layer Addr State Interface 2001:AAAA:BBBB:CCCC:1234:1234:1234:1234 23 0006.2A15.BD01 REACH Fa0/0 FE80::206:2AFF:FE15:BD02 7 0006.2A15.BD02 REACH Fa0/1

To check IPv6 Routing Table we use “ show ipv6 route ”.

Router 1# show ipv6 route IPv6 Routing Table – 3 entries Codes: C – Connected, L – Local, S – Static, R – RIP, B – BGP U – Per-user Static route, M – MIPv6 I1 – ISIS L1, I2 – ISIS L2, IA – ISIS interarea, IS – ISIS summary O – OSPF intra, OI – OSPF inter, OE1 – OSPF ext 1, OE2 – OSPF ext 2 ON1 – OSPF NSSA ext 1, ON2 – OSPF NSSA ext 2 D – EIGRP, EX – EIGRP external C 2001:AAAA:BBBB:CCCC::/64 [0/0] via ::, FastEthernet0/0 L 2001:AAAA:BBBB:CCCC:2E0:B0FF:FE0E:7701/128 [0/0] via ::, FastEthernet0/0 L FF00::/8 [0/0] via ::, Null0

To check IPv6 DHCP we use “ show ipv6 dhcp ”.

Router 1# show ipv6 dhcp This device’s DHCPv6 unique identifier (DUID): 0003000100E0B00E7701

To check IPv6 Protocols we use “ show ipv6 protocols ”.

Router 1# show ipv6 protocols IPv6 Routing Protocol is “connected” IPv6 Routing Protocol is “static

Questions For IPv6 Configuration

Question 1: with which command do we enable ipv6 globally for ipv6 configuration.

a) ipv6 enable

b) ipv6 unicast-routing

c) ipv6 no shutdown

d) ipv6 run

Question 2: Which command enables IPv6 under an interface?

Question 3: which command enables auto ipv6 addressing under an interface .

a) ipv6 auto

d) ipv6 address autoconfig

e) ipv6 run

Question 4: Which command enables DHCPv6 under an interface?

a) ipv6 auto dhcp

b) ipv6 address dhcp

c) ipv6 address autoconfig

d) ipv6 dhcp run

e) ipv6 dhcp on

Question 5: How to send 20 ping packet to 001:AAAA:BBBB:CCCC:1111:2222:3333:4444 address?

a) ping ipv6 2001:AAAA:BBBB:CCCC:1111:2222:3333:4444 source 20

b) ping ipv6 2001:AAAA:BBBB:CCCC:1111:2222:3333:4444 size 20

c) ping ipv6 2001:AAAA:BBBB:CCCC:1111:2222:3333:4444 repeat 20

Answers: 1) b 2) a 3) d 4) b 5) c

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An IPv6 is the sixth version of any IP address on the IP protocol. It consists of eight groups of four hexadecimal digits. IP v6 is a 128-bits address having an address space of 2^128.

For more details about IPv6 refer to the articles: What is IPv6? and Internet Protocol version 6 (IPv6) .

Steps to Configure IPv6 on Cisco Packets Tracer:

Step 1: First open the Cisco packet tracer desktop and create a network topology something like the image and an IPv6 addressing table given below.

IP Addressing Table:

Step 2: Configuring the GigabitEthernet Interfaces.

First, we will configure the GigabitEthernet0/0 using CLI.
Click on router0 and go to CLI and type the commands are given below:
Now we will configure the GigabitEthernet0/1 Interface.
Then, both the interfaces will be active now:

Step 3: Configuring Ipv6 address in both Interfaces using CLI:

CLI commands to configure IPv6 address in GigabitEthernet0/0 and GigabitEthernet0/1 ports are given below:

Step 4: We have configured the router now change the settings of hosts in IPv6 configuration:

First, click on PC0 and go to desktop then IP configuration.
Now find the IPv6 configuration.
Change the settings from static to automatic and then after a few seconds, the IPv6 address and default gateway are displayed.

Similarly, repeat this procedure with PC1 and PC2

Step 5: Now we have to verify the connection by pinging the IPv6 address of PC0 in PC1.

First, click on PC1 and go to the command prompt, and type ping <ipv6 address>
As we can see in the below image, getting replies from PC0 means the connection is established successfully.

Simulation Result:

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How to configure ipv6 address in Linux (RHEL / CentOS 7/8)

January 2, 2024

Linux , How To , Tips and Tricks

This step by step by guide to configure IPv6 address is validated on RHEL and CentOS 7 .

IPv6 can act as a replacement for the IPv4 network protocol. The major problem it solves is the exhaustion of IPv4 addresses by using a much larger network address space. It also provides a number of enhancements and new features for network configuration management and support for future protocol changes.

The key reason IPv6 is not yet in wide deployment is that the core protocol does not have a simple way for systems that only have IPv6 addresses to communicate with systems that only have IPv4 addresses.

An IPv6 address is a 128-bit number , normally expressed as eight colon-separated groups of four hexadecimal nibbles (half-bytes). Each nibble represents four bits of the IPv6 address, so each group represents 16 bits of the IPv6 address.

To make it easier to write IPv6 addresses, leading zeros in a colon-separated group do not need to be written. However at least one nibble must be written in each field. Zeros which follow a non zero nibble in the group do not need to be written.

Since addresses with long strings of zeros are common, combine one or more groups of consecutive zeros with exactly one :: block.

Notice that under these rules 2001:1:1:1443::400 would be another less convenient way to write the example address. But it is a valid representation of the same address, and this can confuse administrators new to IPv6.

Some tips for writing consistently readable addresses

Always suppress all the leading zeros in a group
Use :: to shorten as much as possible. If two runs of zeros are equal in length, shorten the leftmost run of zeros by preference.
Although it is allowed, do not use :: to shorten one group of zeros, Use :0: instead, and save :: for runs of zeros longer than a single group.
Always use lowercase letters for hexadecimal numbers a through f .

Pre-requisite before starting to configure IPv6 address

Make sure that IPv6 is enable on your node. Look out for below entry in your sysctl configuration

This will list the IPv6 status for the default value and per interface value.

Here " 0 " means IPv6 is in active on our node, if the above returns " 1 " then it means IPv6 is disable on your node. So if the IPv6 is disable then your IPv6 configuration will not work.

I have already written an article with steps to enable or disable IPv6

Comparison of nm-setting and ifcfg-* directives

The following table maps some of the key NetworkManager settings name relevant to IPv6 connections to ifcfg-* directives.

Configure IPv6 address using Network Manager.

Open Network Manager Console from your Linux node

Select Edit a Connection and click on Ok

How to configure ipv6 address in Linux (RHEL / CentOS 7/8)

Next look out for your Ethernet card on which you wish to configure IPv6 address. If your NIC card does not appear on the list then you can add a new device . Since for me my device ( eno50 ) exists, so I will select the device and select Edit

This will bring you the main configuration page where you must give all the details to configure IPv6 address. Since I do not want to add IPv4 address to the same Ethernet device, I have disabled the IPv4 option.

Provide the IPv6 address/subnet and the gateway . Make sure you select Automatically Connect

Lastly click OK to exit the utility.

Next restart the network services to activate the changes

Now let us check the network configuration of eno50

So looks like I was able to successfully configure my interface with IPv6 address.

Validate the connectivity by pinging the IPv6 gateway

So I am able to connect to my gateway which means my IPv6 configuration was successful.

Configure IPv6 address using CLI

The following command will add a new connection for the interface eno49 , which will auto connect at startup, getting IPv4 networking information using DHCPv4. It will also get IPv6 networking settings by listening for router advertisements on the locallink.

The below command configures the eno49 interface statically using the IPv6 address and network prefix 2001:1:1:1443::433/122 and default IPv6 gateway 2001:1:1:1443::43F , but it still auto connects at startup and saves its configuration into /etc/sysconfig/network-scripts/ifcfg-eno49 .

Let us validate our configuration by pinging the gateway using eno49 interface

Again with the CLI looks like the steps are successful for me.

Modify existing IPv6 configuration

In the below command we are changing the IPv6 address of our interface eno49 from 2001:1:1:1443::433 to 2001:1:1:1443::434 , while the gateway remains the same.

Restart the eno49 interface

Next bring the the interface

Validate the new IP address for eno49 device

Check the connectivity from eno49 to it's gateway

Check the configuration file for eno49

I hope the steps from the article to configure IPv6 address on Linux (CentOS/RHEL 7/8) was helpful. Let me know your suggestions and feedback using the comment section.

Deepak Prasad

He is the founder of GoLinuxCloud and brings over a decade of expertise in Linux, Python, Go, Laravel, DevOps, Kubernetes, Git, Shell scripting, OpenShift, AWS, Networking, and Security. With extensive experience, he excels in various domains, from development to DevOps, Networking, and Security, ensuring robust and efficient solutions for diverse projects. You can connect with him on his LinkedIn profile.

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6 thoughts on “How to configure ipv6 address in Linux (RHEL / CentOS 7/8)”

One update for Centos 8. Change systemctl restart network to systemctl restart NetworkManager.service

I really love your website.. Very nice colors & theme. Did you make this amazing site yourself? Please reply back as I’m planning to create my very own site and want to know where you got this from or exactly what the theme is called. Kudos!

For us noobs: the network should be restarted after the address setup:

service network restart

Thanks for your feedback, I have updated the article 🙂

How did you get /122 when creating the new ip address and same gateway example?

This is the gateway and subnet provided by our network team.

Cisco cBR Converged Broadband Routers DOCSIS Software Configuration Guide for Cisco IOS XE Cupertino 17.9

Bias-free language.

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

Start Up Configuration of the Cisco cBR Router
Cisco Smart Licensing
Core Peak Bandwidth Licensing
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Consolidated Packages and SubPackages Management
Support for 2x100G DPIC
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Model-Driven Telemetry
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Supervisor Redundancy
Line Card Redundancy
Downstream Interface Configuration
Upstream Interface Configuration
DOCSIS Interface and Fiber Node Configuration
Service Group Based Configuration of the Cisco cBR Router
DOCSIS Load Balancing Groups
DOCSIS Load Balancing Movements
DOCSIS 3.0 Downstream Bonding
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Downstream Resiliency Bonding Group
Downstream Channel ID Assignment
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Generic Routing Encapsulation
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Downgrading Channel Bonding in Battery Backup Mode
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Reducing Power Consumption
Low Latency DOCSIS
L2VPN Support over Cable
L2VPN Over Port-Channel
MPLS Pseudowire for Cable L2VPN
MPLS VPN Cable Enhancements
Multicast VPN and DOCSIS 3.0 Multicast QoS Support
EtherChannel for the Cisco CMTS
Flow-Based per Port-Channel Load Balancing
MPLS QoS via TLV for non-L2VPN Service Flow
IPsec Security Support
DHCP, ToD, and TFTP Services for CMTS Routers
Virtual Interface Bundling

IPv6 on Cable

Cable DHCP Leasequery
DHCPv6 Bulk-Lease query
Layer 3 CPE Mobility
DOCSIS 3.0 Multicast Support
IPv6 Segment Routing on Cisco cBR
IP Access Control Lists
Creating an IP Access List and Applying It to an Interface
Creating an IP Access List to Filter IP Options, TCP Flags, Noncontiguous Ports
Refining an IP Access List
IP Named Access Control Lists
IPv4 ACL Chaining Support
IPv6 ACL Chaining with a Common ACL
Commented IP Access List Entries
Standard IP Access List Logging
IP Access List Entry Sequence Numbering
ACL IP Options Selective Drop
ACL Syslog Correlation
IPv6 Access Control Lists
IPv6 Template ACL
IPv6 ACL Extensions for Hop by Hop Filtering
Unique Device Identifier Retrieval
Advanced-Mode DOCSIS Set-Top Gateway 1.2 for the Cisco CMTS Routers
Cisco Network Registrar for the Cisco CMTS Routers
PacketCable and PacketCable Multimedia
COPS Engine Operation
Dynamic Bandwidth Sharing
Modular Quality of Service Command-Line Interface QoS
DOCSIS 1.1 for the Cisco CMTS Routers
Default DOCSIS 1.0 ToS Overwrite
DOCSIS WFQ Scheduler on the Cisco CMTS Routers
Fairness Across DOCSIS Interfaces
Service Group Admission Control
Subscriber Traffic Management
Narrowband Digital Forward And Narrowband Digital Return
Differentiated Services Code Point Downstream
Dynamic Shared Secret
Lawful Intercept Architecture
Cable Monitoring Feature for Cisco cBR Series Routers
Source-Based Rate Limit
Cable Duplicate MAC Address Reject
Cable ARP Filtering
Subscriber Management Packet Filtering Extension for DOCSIS 2.0
MAC Filtering
SNMP Support over VPNs—Context-Based Access Control
SNMP Engine Enhancement
Onboard Failure Logging
Control Point Discovery
IPDR Streaming Protocol
Usage-Based Billing (SAMIS)
Frequency Allocation Information for the Cisco CMTS Routers
Flap List Troubleshooting
Maximum CPE and Host Parameters
SNMP Background Synchronization
Online Offline Diagnostics
Factory Reset

Chapter: IPv6 on Cable

Hardware compatibility matrix for the cisco cbr series routers, multicast restrictions, qos restrictions, features supported, overview of the docsis 3.0 network model supporting ipv6, overview of cable modem ipv6 address provisioning, overview of ipv6 dual stack cpe support on the cmts, overview of ipv6 over subinterfaces, docsis pre ha, docsis line card ha, dynamic channel change, overview of ipv6 vpn over mpls, cable monitor, overview of ipv6 cpe router support on the cisco cmts, support for ipv6 prefix stability on the cmts, configurable dhcpv6 relay address, support for multiple iapds in a single advertise, ipv6 neighbor discovery gleaning, configuring ipv6 switching services, configuring the cable virtual bundle interface, configuring the ip provisioning mode and bundle on the cable interface, enabling mdd with pre-registration dsid, configuring ipv6 cable filter groups, cable filter groups and the docsis subscriber management mib, troubleshooting tips, configuring ipv6 domain name service, configuring ipv6 source verification, configuring ipv6 vpn over mpls, configuring dhcpv6 relay agent, configuring ipv6 source address and link address, configurable docsis cmts capabilities dhcpv6 field, disabling ipv6 nd gleaning, example: ipv6 over subinterfaces, example: basic ipv6 cable filter groups, example: complete cable configuration with ipv6, example: bgp configuration for 6vpe, example: subinterface configuration for 6vpe, example: cable interface bundling, example: vrf configuration for 6vpe, verifying ipv6 vrf configuration, verifying ipv6 bgp status, verifying mpls forwarding table, verifying ipv6 cable modem and its host state, verifying multiple iapds in a single advertise, supported mibs, additional references, feature information for ipv6 on cable.

Cisco cBR series Converged Broadband Router supports full IPv6 functionality.

The IPv6 feature support available in the Cisco IOS software and for Cisco CMTS routers is extensive. This document provides a comprehensive overview of all of the IPv6 features supported on the Cisco CMTS routers, and their restrictions.

However, the details of every feature are not covered in this document. The areas of IPv6 protocol support for the Cisco CMTS routers discussed in this document are classified by platform-independence or by platform-specific feature support.

Platform-independent IPv6 features—Describes IPv6 features that are supported in the Cisco IOS software for several other Cisco platforms, and which generally do not have any platform-specific behavior or configuration differences on the Cisco CMTS routers.

Documentation about the restrictions for these platform-independent features can be found in the Restrictions for IPv6 on Cable.

Detailed information about these features, including conceptual and task-based configuration information, is documented outside of this feature and in the Cisco IOS software documentation. Detailed information about the location of this related documentation in the Cisco IOS software documentation is described in the Feature Information for IPv6 on Cable.

Platform-specific IPv6 features—Describes IPv6 features that are specific to the cable technology area and that only apply to the supported Cisco CMTS routers. The cable-specific IPv6 feature support includes new or modified cable features supporting IPv6, and any transparent support of the IPv6 protocol in existing (legacy) cable features on the CMTS router platforms.

Your software release may not support all the features that are documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. The Feature Information Table at the end of this document provides information about the documented features and lists the releases in which each feature is supported.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/ . An account on http://www.cisco.com/ is not required.

Restrictions for IPv6 on Cable

IPv6 multicast has the following behavior restrictions on the Cisco CMTS routers:

ICMP redirects are not sent to the originating host if the packet is destined for another CPE behind the same CM. All CPE-to-CPE traffic is processed by the Cisco CMTS router.
IPv6 multicast forwarding is not supported in Parallel Express Forwarding (PXF), therefore, the IPv6 multicast forwarding performance is limited by the Router Processor (RP).

The following areas of IPv6 multicast are not supported by the Cisco CMTS routers:

Address family support for Multiprotocol Border Gateway Protocol (MBGP)

Bidirectional Protocol Independent Multicast (PIM)

Bootstrap router (BSR)

DOCSIS 3.0 encrypted multicast

Explicit tracking of receivers

IPv6 multicast echo

Multicast Forwarding Information Base (MFIB) display enhancements

Multicast use authentication and profile support

PIM embedded rendezvous point

Protocol Independent Multicast sparse mode (PIM-SM) accept register feature

Reverse path forwarding (RPF) flooding of bootstrap router (BSR) packets

Routable address hello option

Source Specific Multicast (SSM) mapping for Multicast Listener Device (MLD) version 1 SSM

In Cisco IOS-XE Release 16.5.1 , the following fields are supported for theIPv6 downstream classification:

IPv6 dest addr

ipv6 src addr

IPv6 next header

IPv6 traffic class

The following areas of DOCSIS QoS are not supported by the Cisco CMTS routers:

Upstream IPv6 Type of Service (ToS) overwrite

Downstream IPv6 classification

Information About IPv6 on Cable

This section includes the following topics:

The following features are supported on the Cisco CMTS routers:

Source verification of IPv6 packets in PXF
ACL support for PXF
ToS overwrite
DOCSIS classification
Modular QoS CLI (MQC) on Gigabit Ethernet
IPv6 DOCSIS RP and LC HA and DCC
MAC tapping of IPv6 packets
Equal cost route load balancing of IPv6 packets destined to the backhaul
IPv6 over IPv4 GRE tunnels
Assignment of different prefixes to CM and CPE
DHCPv6 over MPLS-VPN
DHCPv6 relay prefix delegation VRF awareness
Assignment of multiple IAPDs in a single advertise for each CPE.
Assignment of multiple IA_NA and IAPD combinations to multiple CPEs behind a CM.
The default maximum number of IA_NA and IAPD combinations for each cable modem is 16, including link-local addresses.
IPv6 Downstream ToS overwrite.
DHCPv6 Client Link-Layer Address Option (RFC 6939).

Voice over IPv6. PacketCable Multimedia needs to be enabled before using this feature. For more information, see http://www.cisco.com/c/en/us/td/docs/cable/cbr/configuration/guide/b_pktcbl_pktcblmm/packetcable_and_packetcable_multimedia.html .

Figure below illustrates the network model described by the DOCSIS 3.0 MAC and Upper Layer Protocols Interface Specification .

In this model, the different devices support the following functions and services:

Customer premises equipment (CPE)—Supports IPv4, IPv6, or dual stack operation.

Cable modem (CM)—Functions as a bridging device and supports IPv4, IPv6, or dual stack operation.

Cable modem termination system (CMTS) router—Works with the CM over the hybrid fiber coaxial cable (HFC) network to provide IPv4 and IPv6 network connectivity to the provisioning servers and the core data network behind the CMTS router.

The CMTS router supports IPv6 address assignment, routing, and forwarding of IPv6 multicast and unicast packets.

Simple Network Management Protocol (SNMP) agent—Provides management tools to configure and query devices on the network.

Syslog server—Collects messages from the CM to support its functions.

Dynamic Host Control Protocol (DHCP) server—The DOCSIS 3.0 network model supports both DHCPv4 and DHCPv6 servers to control the assignment of IP addresses.

Time server—Provides the current time to the CM.

Trivial File Transport Protocol (TFTP) server—Provides the CM configuration file.

Prior to cable modem registration with a CMTS router, the CMTS router sends a MAC Domain Descriptor (MDD) message to provide information to the cable modem about its supported IP provisioning mode. You configure the CMTS router provisioning mode using the cable ip-init interface configuration command. For more information, see the Implementing IPv6 Addressing and Basic Connectivity for Cable Interfaces and Bundles .

The MDD contains an IP initialization parameters type length value (TLV) that defines the IP version, management and alternate provisioning mode, and pre-registration downstream service ID (DSID) that is used by cable modems that are capable of downstream traffic filtering.

When IPv6 is configured and active, for transmitting multicast DSID carrying IPv6 ND messages within a MAC domain, the CMTS contains the pre-registration DSID TLV encoding (type 5.2) in the MDD message.

To support the MULPIv3.0 I04 or later version of the DOCSIS 3.0 MAC and Upper Layer Protocols Interface Specification , the cable modem must attempt IPv6 address acquisition first.

Figure below illustrates the message flow between a cable modem, the CMTS router, and the DHCP server when the cable modem is requesting an IPv6 address.

Link-local address assignment—The cable modem sends a Neighbor Solicit (NS) message with its link-local address (LLA) to the CMTS router, which starts the duplicate address detection (DAD) process for that LLA. The cable modem expects no response to the NS message.

Router discovery—The cable modem listens to the downstream to detect periodical Router Advertise (RA) messages. When an RA message is detected, the cable modem uses the data in the RA message to configure the default route. If an RA is not detected in a specified period, the cable modem sends a Router Solicit (RS) message to find the router on the link (all nodes multicast). The CMTS router responds with a Router Advertise (RA) message with theM and O bits set to 1 to instruct the CM to perform stateful address configuration.

DHCPv6—The cable modem sends a DHCPv6 Solicit message to the CMTS router to request an IPv6 address. The CMTS router relays this message to the DHCPv6 servers. The DHCPv6 servers send an Advertise message indicating the server’s availability.

If the Rapid-Commit option is not used by the cable modem, then the cable modem responds to the Advertise message of the server with a Request message to select the server that the CMTS router relays to the DHCPv6 server. If the Rapid-Commit option is used, then multiple DHCPv6 servers that could assign different addresses to the same CPE must not be used.

The cable modem starts the DAD process to verify the uniqueness of the IPv6 address that the DHCPv6 server assigns to it.

TFTP and Time of Day (ToD)—Once the CM establishes IP connectivity, it sends a request to the TFTP server to download a configuration file and requests the current time from the ToD server to complete its boot process.

Most operating systems (OS) deployed at homes support dual stack operation. Cisco CMTS supports dual stack, which is both IPv4 and IPv6 addressing on the CPE.

Cisco CMTS supports IPv6 over bundle subinterfaces. To configure IPv6 on bundle subinterfaces, see the Implementing IPv6 Addressing and Basic Connectivity for Cable Interfaces and Bundles section. For a CMTS bundle configuration example, see the Example: IPv6 over Subinterfaces section.

To enable IPv6 on subinterfaces, configure IPv6 on bundle subinterfaces and not the bundle. Reset the CMs after the subinterface is configured.

Overview of High Availability on IPv6

Cisco cBR Series routers support IPv6 HA for the Supervisor card.

The IPv6 HA feature support in Cisco CMTS routers covers the following capabilities:

DOCSIS line card HA
Dynamic Channel Change (DCC)

The DOCSIS PRE HA has the following behavior restrictions and prerequisites on the Cisco CMTS routers:

The CMs and CPEs should not go offline after a PRE switchover.
The data structures of the IPv6 CM and CPE should be synchronized to the standby PRE before the PRE switchover. Both dynamic and bulk synchronization is supported.
Single stack, dual stack, and APM are supported for the CM.
Single stack and dual stack provisioning modes are supported on the CPE.
After a PRE switchover, the IPv6 neighbor entries are rebuilt by Neighbor Discovery (ND) messages on the standby PRE, and the IPv6 routes are rebuilt after converging the routing protocol.

The DOCSIS line card HA has the following behavior restrictions and prerequisites on the Cisco CMTS routers:

The data structures of the IPv6 CM and CPE should be synchronized to the standby line card before the line card switchover. Both dynamic and bulk synchronization is supported.
The CMs and CPEs should not fall offline after a line card switches over and reverts; the CMs and CPEs should behave the same as before the switchover.
The DOCSIS line card HA supports both 4+1 and 7+1 redundancy.
Traffic outages in IPv6 may be longer because traffic recovery occurs only after converging the routing protocol.

The Dynamic Channel Change (DCC) feature is supported on Cisco CMTS routers.

The IPv6 and IPv4 DCC functionality has the following behavior restrictions and prerequisites on the Cisco CMTS routers:

Narrowband Cable Modem

If the source and destination MAC domains of the CM are on the same line card, DCC initialization techniques 0, 1, 2, 3, and 4 are used to move the CM and its associated CPE from one upstream or downstream to another; or move the CM and CPE from one upstream and downstream combination to another.
If the source and destination MAC domains of the CM are on different line cards, you can use only the DCC initialization technique 0 to move the CM and its associated CPE across line cards.

Wideband Cable Modem

If the source and destination MAC domains of the CM are on the same line card, DCC initialization techniques 0, 1, 2, 3, and 4 are used to move the CM and its associated CPE from one upstream to another.
If the primary downstream of a CM is changed after DCC, you can use only the DCC initialization technique 0 to move the CM and its associated CPE across line cards.

The Multiprotocol Label Switching (MPLS) VPN feature represents an implementation of the provider edge (PE) based VPN model. This document describes the IPv6 VPN over MPLS (6VPE) feature.

The 6VPE feature allows Service Providers to provide an IPv6 VPN service that does not require an upgrade or reconfiguration of the PE routers in the IPv4 MPLS Core. The resulting IPv6 VPN service has a configuration and operation which is virtually identical to the current IPv4 VPN service.

In principle, there is no difference between IPv4 and IPv6 VPNs. In both IPv4 and IPv6, the multiprotocol BGP is the core of the MPLS VPN for IPv6 (VPNv6) architecture. It is used to distribute IPv6 routes over the service provider backbone using the same procedures to work with overlapping addresses, redistribution policies, and scalability issues.

Figure below illustrates the 6PE/6VPE reference architecture diagram.

The Cable Monitor and Intercept features for Cisco CMTS routers provide a software solution for monitoring and intercepting traffic coming from a cable network. These features give service providers Lawful Intercept capabilities.

For more information, see the Cable Monitor and Intercept Features for the Cisco CMTS Routers guide.

The IPv6 CPE router support is provided on the Cisco CMTS. The IPv6 CPE router is a node primarily for home or small office use that connects the end-user network to a service provider network. It is also referred to as the home router.

The IPv6 CPE router is responsible for implementing IPv6 routing; that is, the IPv6 CPE router looks up the IPv6 destination address in its routing table and decides to which interface the packet should be sent.

The IPv6 CPE router performs the following functions:

Provisions its WAN interface automatically.
Acquires IP address space for provisioning of its LAN interfaces.
Fetches other configuration information from the service provider network.

Figure below illustrates the CPE router reference architecture diagram between the CPE router, the CMTS, and the DHCPv6 server (CNR) when the CM is requesting an IPv6 address.

As part of the IPv6 CPE Router Support feature, the following enhancements are introduced:

Support to IPv6 router devices.
IPv6 Prefix Delegation (PD) High Availability.
Prefix awareness support in IPv6 cable source-verify, Cable DOCSIS filters code, and packet intercepts.

IPv6 prefix stability is supported on the Cisco CMTS as specified in DOCSIS 3.0 MULPI CM-SP-MULPIv3.0-I15-110210 standard. The IPv6 prefix stability allows an IPv6 home router to move from one Cisco CMTS to another while retaining the same prefix.

The multiple service operators (MSOs) can use this feature to allow their business customers (with IPv6 routers) to retain the same IPv6 prefix during a node split.

The DHCPv6 Cisco IOS relay agent on the Cisco CMTS router sends relay-forward messages from a source address to all configured relay destinations. The source address is either an IPv6 address provisioned on the network interface or a Cisco CMTS WAN IPv6 address. The relay destination can be a unicast address of a server, another relay agent, or a multicast address. The relay-forward messages contain specific DHCPv6 link-addresses.

A DHCP relay agent is used to relay messages between the client and server. A client locates a DHCP server using a reserved, link-scoped multicast address.

Use the cable ipv6 dhcp-insert hostname command to configure the Cisco cBR-8 routers for inserting descriptors into DHCPv6 packets and to insert the specific hostname.

DHCPv6 Client Link-Layer Address Option (RFC 6939)

Cisco IOS -XE Releases support DHCPv6 Client Link-Layer Address Option (RFC 6939). It defines an optional mechanism and the related DHCPv6 option to allow first-hop DHCPv6 relay agents (relay agents that are connected to the same link as the client) to provide the client's link-layer address in the DHCPv6 messages being sent towards the server.

The format of the DHCPv6 Client Link-Layer address option is shown below.

To configure DHCPv6 Relay Address on the Cisco CMTS bundle subinterfaces, see the Configuring DHCPv6 Relay Agent section.

For more information about the DHCPv6 client, server, and relay functions, see the Implementing DHCP for IPv6 chapter in the IPv6 Implementation Guide, Cisco IOS XE Release 3S .

Assignment of multiple IA_NA and IAPD to CPEs behind a CM is supported on Cisco CMTS routers. This feature includes support for link-local addresses and IA_NA and IAPD. However, a CM can be assigned only one IA_NA. This IA_NA can be either static or DHCP-assigned.

The CPEs behind the CM can request for multiple DHCPv6 IA_NAs and IAPDs. Each CPE is assigned multiple IA_NAs and IAPDs in a single Advertise/Reply message. Each CPE request for IA_NA and IAPD is treated as a separate Advertise/Reply message.

The IPv6 Neighbor Discovery (ND) Gleaning feature enables Cisco CMTS routers to automatically recover lost IPv6 CPE addresses and update the CPE records in the Cisco CMTS subscriber database. The Cisco CMTS router gleans only the solicited neighbor advertise (NA) messages transmitted in the upstream direction. IPv6 ND gleaning is similar to Address Resolution Protocol (ARP) gleaning for IPv4 CPE recovery.

The IPv6 ND Gleaning feature is configured by default on Cisco CMTS routers. To disable this feature, use the no form of the cable nd command in bundle interface configuration mode. The cable nd command adds a CPE (host behind a cable modem) to the Cisco CMTS subscriber database. This command does not impact the IPv6 ND protocol operation on the router.

How to Configure IPv6 on Cable

This section includes the following tasks:

The CMTS routers support forwarding of unicast and multicast IPv6 traffic using either Cisco Express Forwarding for IPv6 (CEFv6) or distributed CEFv6 (dCEFv6):

CEFv6—All CMTS platforms

dCEFv6—Cisco uBR10012 universal broadband router only

The CMTS routers also support Unicast Reverse Path Forwarding (RPF), as long as you enable Cisco Express Forwarding switching or distributed Cisco Express Forwarding switching globally on the router. There is no need to configure the input interface for Cisco Express Forwarding switching. As long as Cisco Express Forwarding is running on the router, individual interfaces can be configured with other switching modes.

To configure forwarding of IPv6 traffic using Cisco Express Forwarding or distributed Cisco Express Forwarding (supported on the Cisco uBR10012 universal broadband router only) on the CMTS routers, you must configure forwarding of IPv6 unicast datagrams using the ipv6 unicast-routing global configuration command, and you must configure an IPv6 address on the bundle interface using the ipv6 address command.

The show ipv6 cef platform command is supported on the Cisco CMTS platform. You can use the show ipv6 cef platform command for debugging purposes.

Before you begin

You must enable Cisco Express Forwarding for IPv4 globally on the router by using the ip cef or ip cef distributed command before configuring Cisco Express Forwarding v6 or distributed Cisco Express Forwarding v6.

You must configure forwarding of IPv6 unicast datagrams using the ipv6 unicast-routing global configuration command.

You must configure IPv6 addressing on the cable bundle interface.

CEF switching is required for Unicast RPF to work.

Step 4

Do one of the following:

ipv6 cef distributed

Enables Cisco Express Forwarding v6.

Enables distributed Cisco Express Forwarding v6 for IPv6 datagrams.

Step 5

ipv6 unicast-routing

Enables the forwarding of IPv6 unicast datagrams.

What to do next

(Optional) Enable IPv6 multicast routing using the ipv6 multicast-routing command in global configuration mode and configure other multicast features.

Implementing IPv6 Addressing and Basic Connectivity for Cable Interfaces and Bundles

The only required IPv6 configuration on a cable line card interface is the IP provisioning mode. The remainder of the IPv6 features are configured at the virtual bundle interface, which is then associated with a particular cable line card interface to establish its configuration.

Most of the IPv6 features that are supported in interface configuration mode (both cable-specific as well as platform-independent IPv6 features) are configured at a cable bundle interface.

The Cisco CMTS routers support IPv6 routing on the bundle interface and map both IPv6 unicast and multicast addresses into the cable bundle forwarding table, for packet forwarding.

Each bundle interface has a unique link-local address (LLA) to support link-local traffic when IPv6 is enabled. Cisco CMTS routers can support a maximum of 40 active bundle interfaces, which also translates to a maximum of 40 active IPv6-enabled bundle interfaces.

IPv6 commands can be configured on multiple bundle subinterfaces.

The cable ipv6 source-verify and cable nd commands are not compatible with each other in Cisco IOS release 12.2(33)SCE and later. You must disable IPv6 ND gleaning using the no form of the cable nd command before using the cable ipv6 source-verify command to ensure that only DHCPv6 and SAV-based CPEs can send traffic on the router.

Configure the desired platform-independent IPv6 features on the bundle interface, such as Neighbor Discovery and DHCPv6 features.
Configure the IP provisioning mode and bundle on the cable interface.

The CMTS routers allow you to configure cable interfaces to support cable modems provisioned for both IPv4 and IPv6 addressing support (known as “dual stack”), only IPv4 addressing, or only IPv6 addressing. Prior to cable modem registration, the CMTS router sends its supported provisioning mode to the cable modem in the MDD message.

In addition to configuring the provisioning mode on the cable interface, you must also associate the cable interface with a cable bundle. You perform most of the other IPv6 feature configuration at the bundle interface.

Configuration of a bundle interface is required.

Proceed to configuring any other cable interface features that you want to support, such as upstream and downstream features. For more information about the other cable interface features, refer to the Cisco IOS CMTS Cable Software Configuration Guide .

Proceed to configure other optional IPv6 cable features.

When only IPv4 is configured and active, where the IP provisioning mode is IPv4, for Cable Modems to come online, the pre-registration DSID (TLV 5.2) is required in the MAC Domain Descriptor (MDD) message. To enable this pre-registration DSID, use the following command.

By default, this command is disabled.

The Cisco CMTS router supports IPv6 cable filter group capability with IPv6 filter options.

Cable subscriber management is a DOCSIS 1.1 specification, which can be established using the following configuration methods:

CMTS router configuration (via CLI)
SNMP configuration
DOCSIS 1.1 configuration file (TLVs 35, 36, and 37)

This section describes the IPv6 cable filter group feature support of the packet filtering portion of the DOCSIS Subscriber Management MIB (DOCS-SUBMGMT-MIB) using configuration commands on the CMTS routers. This IPv6 cable filter group support extends filter classifiers with IPv6 addressing options for CM and CPE traffic, but is independent of DOCSIS IPv6 classifiers, which are used to match packets to service flows.

Configuration of IPv6 cable filter groups on the CMTS routers is supported according to the following guidelines:

A cable filter group consists of a set of cable filter group commands that share the same group ID.
Separate indexes can be used to define different sets of filters for the same group ID. This can be used to define both IPv4 and IPv6 filters to the same filter group.
Upstream traffic—All traffic coming from CMs is evaluated against the assigned upstream filter group that is configured by the cable submgmt default filter-group cm upstream command.
Downstream traffic—All traffic going to CMs is evaluated against the assigned downstream filter group that is configured by the cable submgmt default filter-group cm downstream command.
Upstream traffic—All traffic coming from CPEs is evaluated against the assigned upstream filter group that is configured by the cable submgmt default filter-group cpe upstream command.
Downstream traffic—All traffic going to CPEs is evaluated against the assigned downstream filter group that is configured by the cable submgmt default filter-group cpe downstream command.

You must create the cable filter group before you assign it to a CM or CPE upstream or downstream.

Step 10

cable filter group group-id index index-num tcp-flags flags-mask flags-value

(Optional) Specifies the TCP flag mask and value to be matched (IPv4 and IPv6 filters):

Step 11

cable filter group group-id index index-num v6-dest-address ipv6-address

(Optional) Specifies the IPv6 destination address that should be matched using the format X:X:X:X::X (IPv6 filters only).

Step 12

cable filter group group-id index index-num v6-dest-pfxlen prefix-length

(Optional) Specifies the length of the network portion of the IPv6 destination address. The valid range is from 0 to 128.

Step 13

cable filter group group-id index index-num v6-src-address ipv6-address

(Optional) Specifies the IPv6 source address that should be matched using the format X:X:X:X::X (IPv6 filters only).

Step 14

cable filter group group-id index index-num v6-src-pfxlen prefix-length

(Optional) Specifies the length of the network portion of the IPv6 source address. The valid range is from 0 to 128 (IPv6 filters only).

Step 15

cable submgmt default filter-group { cm | cpe } { downstream | upstream } group-id

Applies a defined filter group (by specifying its group-id) to either a CM or its CPE devices, for downstream or upstream traffic.

Step 16

cable submgmt default active

(Required if you do not provision TLVs 35, 36, and 37 in the DOCSIS 1.1 CM configuration file)

Enables filters and allows the CMTS to manage the CPE devices for a particular CM (sets the docsSubMgtCpeActiveDefault attribute to TRUE).

The following example shows how to create an IPv6 filter group with ID 254 and an index number of 128. The ip-version ipv6 keywords must be configured to create the IPv6 filter group; otherwise, the default is an IPv4 filter group:

This group filters CM upstream traffic and drops any packets with an IPv6 source address of 2001:33::20B:BFFF:FEA9:741F (with network prefix of 128) destined for an IPv6 address of 2001:DB8::/32 (with network prefix of 128).

All of the cable filter group commands are associated by their group ID of 254 (and index of 128), and the cable submgmt default filter-group command applies the corresponding filter group ID of 254 to CM upstream traffic.

To monitor your cable filter group configuration, use forms of the show cable filter command as shown in the following examples. In these output examples, the output from the show cable filter , show cable filter group 254 , and show cable filter group 254 index 128 commands all display the same information because there is currently only a single filter group and index defined.

You should configure the cable filter group commands prior to applying a filter group using the cable submgmt default filter-group command. Failure to do so results in the following message, and an association to a filter group that is undefined:

Cisco IOS releases support the domain name service (DNS) capability for devices using IPv6 addressing on the Cisco CMTS routers.

DNS simplifies the identification of cable devices by associating a hostname with what can often be a complex 128-bit IPv6 address. The hostname can then be used in place of the IPv6 address within the CMTS router CLI that supports use of hostnames.

There are two separate DNS caches supported on a CMTS router—an IOS DNS cache and a cable-specific DNS cache that stores IPv6 addresses learned by the CMTS router for CMs and CPEs.

In this phase of the IPv6 DNS service on cable, the DNS server is queried for domain name information as needed when you use the show cable modem domain-name command. When you use this command, the following actions take place:

The CMTS router checks whether CMs are online. If a CM is online, the CMTS router uses the corresponding IPv6 address assigned to the CM and looks up its domain name from the IOS DNS cache.
If no match is found, the CMTS router sends a DNS-QUERY message with the IPv6 address of the CM to the DNS server, which tries to resolve the domain name.
When the DNS reply is received, the CMTS router stores the domain name in the IOS DNS cache for each IPv6 address.
The CMTS router also stores the fully-qualified domain name (FQDN) that is replied by the DNS server in the cable-specific DNS cache.

The following platform-independent Cisco IOS -xe software commands are supported using host names by the CMTS router for IPv6 DNS on cable:

A DNS server must be configured.

You must identify and assign the host names to the IPv6 addresses. If you are using the Cisco DNS server, use the ip host global configuration command to map hostnames to IP addresses.

You must configure the DNS server using the ip name-server global configuration command before use of DNS host names (or domains) are available in the supported commands.

The show cable modem domain-name command must be run first on the Route Processor (RP) of the CMTS router before any domain name can be used as part of a cable command.

Typically, the IPv6 source verification feature is enabled on a cable bundle interface. From there, the cable interface is associated with the virtual bundle interface to acquire its configuration.

When you enable IPv6 source verification on a cable line card interface, the source verification routine verifies the MAC address-MD-SID-IP binding of the packet. If the source verification succeeds, the packet is forwarded. If the verification fails, the packet is dropped.

When a CM is operating as a bridge modem device, then the CMTS router verifies all the IPv6 addresses related to that CM and the CPEs behind that CM.

The cable ipv6 source-verify command controls only the source verification of IPv6 packets. For IPv4-based source verification, use the cable source-verify command, which also supports different options.

For more information about how to configure IPv6 source verification on a bundle interface, see the Configuring the Cable Virtual Bundle Interface .

Restrictions

Source verification of IPv6 packets occurs only on packets in the process-switched path of the Route Processor (RP).

The Cisco CMTS routers support the IPv6 VPN over MPLS (6VPE) feature. Implementing this feature includes the following configuration tasks.

Configuring a VRF instance for IPv6

Binding a VRF to an interface

Creating a subinterface

Configuring a static route for PE-to-CE-routing

Configuring eBGP PE-to-CE routing sessions

Configuring the IPv6 VPN address family for iBGP

Configuring route reflectors for improved scalability

Configuring Internet access

For detailed information about the configuration examples, see Configuration Examples for IPv6 on Cable .

The Cisco CMTS router supports DHCPv6 relay agent to forward relay-forward messages from a specific source address to client relay destinations.

Perform the following steps to enable the DHCPv6 relay agent function and specify relay destination addresses on an interface.

The relay-forward messages must contain specific source IPv6 address. This is required because the firewall deployed between the Cisco CMTS DHCPv6 relay agent and the DHCPv6 server expects only one source address for one Cisco CMTS bundle interface.

In some network deployments, there is a firewall between CNR servers and CMTS router. The firewall only allows packets from certain addresses to transmit to CMTS router.

To allow the DHCPv6 message to be sent to CNR server with specific source address, user needs to configure the source address of the relayed forwarded DHCPv6 message in the following 3 ways:

In the global configuration mode, use the command ipv6 dhcp-relay source-interface interface-type interface-number

In the interface configuration mode, use the command ipv6 dhcp relay source-interface interface-type interface-number

In the interface configuration mode, use the command ipv6 dhcp relay destination ipv6-address[interface] [ link-address link-address ] [ source-address source-address]

If the user does not have any of the above configuration, the DHCPv6 message will be relay forwarded with default source-address, which will be calculated based on relay destination address.

If any one of above is configured, the source-address of the DHCPv6 message will be based on that configuration.

If more than one configuration above is configured, the overriding rule is that more specific configuration wins, i.e., 3>2>1.

According to DOCSIS 3.1 specification, CMTS must support DOCSIS 3.0 cable modems and features. To support the backward compatibility of DOCSIS versions, the DHCPv6 vendor option must change from 30 to 31.

You can now upgrade to any DOCSIS version using the cable docsis-ver [major version | minor version] command.

The default value of the command is cable docsis-ver 3 1 .

You must disable IPv6 ND gleaning before configuring IPv6 source verification using DHCPv6 leasequery.

How to Verify IPv6 Dual Stack CPE Support

This section describes how to use show commands to verify the configuration of the IPv6 Dual Stack CPE Support on the CMTS feature.

Use the show cable modem ipv6 command to display the IPv6 portion of a dual stack CPE and use the show cable modem cpe command to display the IPv4 mode of a dual stack CPE. Both show cable modem ipv6 registered and show cable modem registered commands display CPE count as one for a dual stack CPE.

The following example shows the output of the show cable modem ipv6 command:

The following example shows the output of the show cable modem registered command:

The following example shows the output of the show cable modem cpe command:

Configuration Examples for IPv6 on Cable

This section includes the following examples:

The following example shows the CMTS bundle configuration that can be used with subinterfaces:

The following example shows the configuration of an IPv6 filter group that drops traffic from a specific IPv6 host (with source address 2001:DB8::1/48) behind a cable router to an IPv6 host on the network (with destination address 2001:DB8::5/64):

The following example shows a complete cable configuration example; it also displays the configuration of multiple cable filter groups using both IPv4 and IPv6 and separate indexes to associate the filter definitions with the same group ID.

The following example shows a sample BGP configuration on CMTS 6VPE.

The following example shows how to define a subinterface on virtual bundle interface 1.

When configuring IPv6 VPNs, you must configure the first subinterface created as a part of the management VRF. In the following example, Bundle 1.10 is the first sub-interface, which is configured into management VRF. Make sure the CNR server is reachable in management VRF.

The following example shows how to bundle a group of physical interfaces.

The following example shows how to create VRFs for each VPN.

Verifying IPv6 on Cable

This section explains how to verify IPv6 on cable configuration and it contains the following topics:

To verify the IPv6 VRF configuration, use the show vrf ipv6 command in privileged EXEC mode.

To verify the IPv6 BGP status, use the show ip bgp command in privileged EXEC mode.

To verify the output of the MPLS forwarding table, use the show mpls forwarding-table command in the privileged EXEC mode.

To verify IPv6 addresses and connected host states of cable modems and CPEs, use the show interface cable modem command in the privileged EXEC mode:

To verify the multiple IPv6 prefixes assigned to devices on a network, use the show cable modem ipv6 prefix command in privileged EXEC mode:

To verify the multiple IPv6 prefixes assigned to CPEs behind a CM with a specific MAC address, use the show cable modem mac-address ipv6 prefix command in privileged EXEC mode:

To verify the IPv6 information of CPEs behind a CM with a specific MAC address, use the show cable modem mac-address ipv6 cpe command in privileged EXEC mode:

CISCO-DOCS-EXT-MIB

The CISCO-DOCS-EXT-MIB contains objects that support extensions to the Data-over-Cable Service Interface Specifications (DOCSIS) interface MIB, DOCS-IF-MIB.

CdxBundleIpHelperEntry—Provides a list of cable helper entries on the bundle and sub-bundle interfaces.

CdxBundleIPv6DHCPRelayEntry—Contains the IPv6 DHCP relay option, IPv6 DHCP relay source-interface details, and IPv6 DHCP relay trust configuration on a bundle and sub-bundle interface.

CdxBundleIPv6DHCPRelayDestEntry—Contains a list of IPv6 DHCP relay destination entries on the cable bundle and sub-bundle interfaces.

Technical Assistance

Use Cisco Feature Navigator to find information about the platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to the https://cfnng.cisco.com/ link. An account on the Cisco.com page is not required.

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Guide to Linux ip Command With Examples

Last updated: May 17, 2024

Administration

1. Overview

IP is the abbreviation for Internet Protocol in networking. Like the ifconfig utility, the ip command is a network utility specifically designed for managing Linux system networks .

The main goal of the ip command is to configure different network interfaces . In this tutorial, we’ll use the ip command with various available options.

2. Syntax of ip Command

The ip command has a straightforward syntax. First, the ip command alone in the terminal can display its general syntax:

Here’s what we can learn about the ip command from the above output:

The above syntax shows that the command starts with the ip keyword followed by available OPTIONS .
OPTIONS represent flags used to amend the behavior of the ip command.
The OBJECT can be a placeholder for network-related objects on which the ip command will operate, such as address , help , and others.

3. General Usage of ip Command

As discussed before, the Linux system provides different options to be used within the ip command to get various output information.

Thus, let’s look at a few of the other options and objects that are available one by one.

3.1. Using ip Command With link Object

The ip command and the link object are used for displaying and managing all the available network interfaces on Linux systems .

Here, we’re executing ip link to display all network interfaces:

In this example, lo denotes the loopback interface specified for a local host. Meanwhile, enp0s3 is an ethernet network interface on slot 3.

The output of this command displays the two devices along with their network status, such as UNKNOWN and UP . However, qlen is the device’s default transmit queue length measured in packets. The above interfaces have a default 1000-packet queue, which means the 1001 packet would be dropped.

Meanwhile, if we need to get data about a specific device, such as enp0s3 , we need to mention it after the keyword dev :

Here, the output displayed in return is specific for the ethernet device enp0s3 .

3.2. Get Stats Using the -s OPTION

Sometimes, we want to get the stats about the transferred or dropped packets over the Linux network. For this, we specify the -s option of the ip command and the link object:

In return, the stats regarding the two devices are displayed on the terminal. The RX stands for Received, while the TX stands for Transmitted network data . Also, we have information about the total bytes and packets received and transferred over the network. These stats do not include errors, dropped packets, or missed data packets.

Meanwhile, to get network data information about a single device, such as enp0s3 , let’s use the ls command followed by the device name :

Now, we’re adding another -s option to the ip command, which can display even more details about the network traffic:

Hence, the above output has a separate section of received and transferred network data about the errors.

3.3. Update Network Interface Status

A networking device’s status can be up , down , or unknown and can be updated when necessary . up means that the network interface is active and can transmit data, and down means that it’s currently disabled.

Let’s use the ip link command to set the status of the lo network interface to up first and then down :

If the command executes successfully, no output message will be displayed.

According to our system’s hardware capabilities, the network interface performance can be slowed down or sped up by updating the values of the transmit queue and mtu (maximum transmitting unit) .

We’re using the ip link command to set the txqueuelen and mtu values to 5 for the network device lo :

Again, no output is displayed on the terminal.

3.4. Manage IP Addresses With the addr OBJECT

The ip command can be executed with the object addr to get information about the IP addresses associated with the network interfaces:

Above, the command outputs the IP address, subnet mask, and other information for the ethernet interface enp0s3 . The output for the loopback interface is nothing more than its mtu value and state as UNKNOWN .

Similarly, we can use the show option in the command to get the information on IP addresses for the network interfaces separately, followed by the device name:

Additionally, we can list the network interfaces with IPv4 or IPv6 addresses by using the options -4 and -6 , respectively, in the ip addr command:

Thus, we can see the output separately for both available network interfaces.

3.5. Adding an IP Address

We can also use the ip command to assign IP addresses to network interfaces.

Here, we’re using the ip addr command and the add option to add IP address 192.168.10.10 to the loopback interface. If successful, this command doesn’t return anything:

Additionally, to verify the success of the add option in the above command, let’s use the show option in the ip addr command:

Finally, the terminal result shows that the inet address 192.168.10.10 was successfully added to the network interface.

3.6. Removing an IP Address

Just like we can assign an IP address to a network device, the ip addr command provides an option del to remove an IP address for a specific network device .

Let’s see how to remove an IP address from the loopback interface using ip addr del :

After that, the command displays a warning and successfully removes the IP address from the network device lo .

3.7. Managing the Routing Table

The routing table provides information regarding data routing towards the destination . The ip command displays the routing table by using its route object:

Here, the first line of the output depicts the default route 10.0.2.2 .

3.8. Adding a New Entry to the Routing Table

The ip route add command can add a new route to the routing table.

Here, we’re adding a new route to the network interface enp0s3 by executing the ip route command with the add option followed by a new IP address 192.169.10.10 :

Let’s execute the ip route list command to confirm that the new route was successfully added:

Thus, the routing table displays a new entry.

4. Conclusion

In this article, we discussed the ip command and its syntax in detail. The ip command can display network interface information and its stats. The network interface status can also be updated by using ip command.

Finally, we used ip to get information about the IP addresses associated with the network interfaces, assigned and removed IP addresses, displayed information about the routing table, and added a new entry.

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COMMENTS

IPv6 Addressing and Basic Connectivity Configuration Guide ...
When IPv6 or IPv4 command output displays an IPv6 address, a long IPv6 address can overflow into neighboring fields, causing the output to be difficult to read. ... Configuring IPv6 Addressing and Enabling IPv6 Routing. Perform this task to assign IPv6 addresses to individual device interfaces and enable IPv6 traffic forwarding globally on the ...
How to Configure IPv6 Address on Cisco Routers with Example
Extended Unique Identifier or EUI-64 format allows a host to automatically assign itself a unique 64-bit IPv6 interface identifier without manual configuration. ... Cisco IOS supports IPv6 many years ago, but it is not enabled by default and needs to be explicitly enabled with the command "ipv6 unicast routing".
IPv6 Commands: ipv6 a to ipv6 g
Usage Guidelines. The ipv6 access-class command is similar to the access-class command, except that it is IPv6-specific.. Identical restrictions should be set on all the virtual terminal lines because a user can connect to any of them. The incoming connection source address is used to match against the access list source prefix.
IPv6 Configuration Guide
Perform this task to assign IPv6 addresses to individual device interfaces and enable IPv6 traffic forwarding globally on the device. By default, IPv6 addresses are not configured and IPv6 routing is disabled. ... on the device with the ipv6 unicast-routing command, an IPv6 address has been configured on Gigabit Ethernet interface 0/0/0 with ...
IPv6 Address Assignment Example
In this lesson we'll take a look how you can create IPv6 prefixes and subnets so that you can configure your entire network with IPv6. We'll start at the top where IANA (Internet Assigned Numbers Authority) is responsible for the global coordination of the IPv4 and IPv6 address space and move our way all the way to the bottom where we assign subnets and IPv6 addresses to our routers ...
How to configure IPv6 Static Route
IPv6 Address Types; IPv6 Address Assignment Example; IPv6 EUI-64 explained; IPv6 Summarization Example; IPv6 General Prefix; ... I still did not get how you get it to write it in your command line below, "Futura(config) #ipv6 route 2001::2/128 fastEthernet 0/0 FE80::CE0A:22FF: ...
IPv6: How to configure static and DHCP IP addressing and deal with DNS
IPv6 offers several ways that aren't possible in IPv4 to assign IP addresses, and DNS set-up has differences as well. ... The third way is to use the Windows PowerShell command-line interface ...
How do I assign IPv6 addresses manually?
The section about specifying the IP addresses that the router assigns by MAC address does not say whether they are IPv4 or IPv6, but I think it is highly unlikely that this will work for IPv6. And here is why. IPv6 is quite unlike IPv4 in the sense that the long IPv6 address is made up of two parts. The first (the prefix) is assigned by the ISP.
Chapter 6. Configuring IPv6 addresses
There are different ways to configure an IPv6 address on an interface. You can use use "ifconfig" or "ip".
Stateless autoconfiguration for IPv6
R2 will have an IPv6 address and is going to send router advertisements. R1 will use this to configure its own IPv6 address. R2(config)#ipv6 unicast-routing R2(config)#interface fastEthernet 0/0 R2(config-if)#ipv6 address 2001:1234::/64 eui-64. Besides configuring an IPv6 address, we must use the ipv6 unicast-routing command to make R2 act like ...
IPv6 Commands
Use the show ipv6 rip command to display IPv6 RIP routes. ... sets an address prefix for address assignment. This address must be in hexadecimal, using 16-bit values between colons. link-address IPv6-prefix sets a link-address IPv6 prefix. When an address on the incoming interface or a link-address in the packet matches the specified IPv6 ...
9 Steps
After going to the configuration mode with "configure terminal" command, to enable IPv6 on a Cisco router, "ipv6 unicast-routing" command is used. With this Cisco command, IPv6 is enabled globally on the router. This can be used before both interface configurations and IPv6 Routing Protocol configurations. Router 1# configure terminal
2. Add an IPv6 address
Adding an IPv6 address is similar to the mechanism of "IP ALIAS" addresses in Linux IPv4 addressed interfaces.
12.9.2 Lab
Step 1: Assign the IPv6 addresses to Ethernet interfaces on R1. Step 2: Enable IPv6 routing on R1. Step 3: Assign IPv6 addresses to the management interface (SVI) on S1. ... On a PC-B command prompt, enter the ipconfig command to examine IPv6 address information assigned to the PC interface.
How to Configure IPv6 on CISCO Router?
Step 2: Configuring the GigabitEthernet Interfaces. First, we will configure the GigabitEthernet0/0 using CLI.; Click on router0 and go to CLI and type the commands are given below:; Router>en Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ipv6 unicast-routing Router(config)#int Gig0/0 Router(config-if)#ipv6 address FE80::1 link Router(config-if)#ipv6 ...
How to Enable IPv6 on a Cisco Router?
First, enable IPv6 routing on a Cisco router using the 'ipv6 unicast-routing' global configuration command. This command globally enables IPv6 and must be the first command executed on the router. Configure the IPv6 global unicast address on an interface using the 'ipv6 address address/prefix-length [eui-64]' command.
How to configure ipv6 address in Linux (RHEL / CentOS 7/8)
Configure IPv6 address using Network Manager (nmtui), CLI, Modify existing IPv6 address using nmci on Linux (RHEL / CentOS 7), Best practices for IPv6 usage ... In the below command we are changing the IPv6 address of our interface eno49 from 2001:1:1:1443::433 to 2001:1:1:1443::434, while the gateway remains the same.
Understand the IPv6 Link-Local Address
IPv6 Address Formats found in the Cisco IOS® IPv6 Command Reference; Components Used. The information in this document is based on the Cisco 3700 series router with Cisco IOS® Software Release 12.4 (15)T1. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document ...
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How to use IPv6 in enterprise networks
IPv6 commands. Network troubleshooters rely on tools like ping and traceroute-- or tracert on Windows -- to help diagnose and correct network issues in IPv4 systems. The process is similar with IPv6. Commands to show IPv6 addresses. Use the standard OS commands to see IPv6 addresses on a workstation. On Linux, type the following: ip addr
12.6.6 Packet Tracer
a. Enter the commands necessary to move to interface configuration mode for GigabitEthernet0/0. b. Configure the IPv6 address with the following command: R1(config-if)# ipv6 address 2001:db8:1:1::1/64. c. Configure the link-local IPv6 address with the following command: R1(config-if)# ipv6 address fe80::1 link-local. d. Activate the interface.
Cisco cBR Converged Broadband Routers DOCSIS Software Configuration
Message Flow for CM Provisioning of DHCP IPv6 Address Assignment Link-local address assignment—The cable modem sends a Neighbor Solicit (NS) message with its link-local address (LLA) to the CMTS router, which starts the duplicate address detection (DAD) process for that LLA. ... IPv6 commands can be configured on multiple bundle subinterfaces.
Guide to Linux ip Command With Examples
We can also use the ip command to assign IP addresses to network interfaces. Here, we're using the ip addr command and the add option to add IP address 192.168.10.10 to the loopback interface. If successful, this command doesn't return anything: $ sudo ip addr add 192.168.10.10 dev lo [sudo] password for aqsa:

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