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adding-ipv6-ubuntu-systems.md

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copyright lastupdated keywords subcollection
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1994, 2022
2021-09-20
IPv6, ipv6 ubuntu
bare-metal

{:shortdesc: .shortdesc} {:codeblock: .codeblock} {:screen: .screen} {:new_window: target="_blank"} {:pre: .pre} {:table: .aria-labeledby="caption"} {:codeblock: .codeblock}

Adding IPv6 to Ubuntu systems

{: #adding-ipv6-to-ubuntu-systems}

Use this procedure to bind IPv6 IP addresses to your Ubuntu server. {: shortdesc}

  1. Edit your /etc/network/interfaces file and add the following lines to the end of the file.

    #IPV6 configuration
iface eth1 inet6 static
pre-up modprobe ipv6 
address 2607:f0d0:2001:0000:0000:0000:0000:0010
netmask 64
gateway 2607:f0d0:2001:0000:0000:0000:0000:0001

    {: pre}

    • The first line defines the interface on which the system uses IPv6.
    • The second line loads the module for IPv6.
    • The third line identifies the IPv6 address.
    • The fourth line defines the netmask for the IPv6 subnet.
    • The fifth line defines the default gateway for the IPv6 subnet.

  2. Restart networking with the following command:

    /etc/init.d/networking restart

    {: pre}

Verifying IPv6 connectivity

{: #verifying-ipv6-connectivity}

Verify that IPv6 IP is bound

{: #verify-that-ipv6-ip-is-bound}

root@server:~# ip -6 address show eth1
3: eth1: mtu 1500 qlen 1000
    inet6 2607:f0d0:2001::/64 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::230:48ff:fe7e:330a/64 scope link
       valid_lft forever preferred_lft forever
root@server:~#

{: pre}

IPv6 neighbor cache

{: #ipv6-neighbor-cache}

root@server:~# ip -6 neighbor show dev eth1
2607:f0d0:2001::1 lladdr 00:1b:0d:e6:57:c0 router REACHABLE
root@server:~#

{: pre}

If the neighbor cache shows a fe80 entry, one of the following conditions can apply:

  • The gateway is not set
  • The IP is not bound to the correct interface
  • The IP is not bound correctly to the public interface
  • The software firewall is blocking IPv6 ICMP.

IPv6 default gateway

{: #ipv6-default-gateway}

root@server:~# ip -6 route show dev eth1
2607:f0d0:2001::/64  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
default via 2607:f0d0:2001::1  metric 1024  mtu 1500 advmss 1440 hoplimit 4294967295
root@server:~#

{: pre}

If the default gateway is not listed, you can use the ping6 command to find your default gateway then add it manually using this IP command:

root@server:~# ip -6 route add default via 2607:f0d0:2001::1
root@server:~#

{: pre}