Netplan – Configuring Dynamic IPv4 and Static IPv6 in Ubuntu 22.04

ipv6netplanubuntu-22.04

With Ubuntu 22.04, the gateway option is deprecated and nearly every example I find for configuring netplan with static IPv6 uses gateway.

My ISP's default /etc/netplan/01-netcfg.yaml only includes dynamic IPv4 and they do not provide DHCP support for IPv6, but they do provide support for static IPv6.

What do I add to the configuration to support IPv6?

$ cat /etc/netplan/01-netcfg.yaml
network:
  version: 2
  ethernets:
    eth0:
      dhcp4: true

I should also add that my ISP also does not provide nameserver support for IPv6 but they do provide an IPv6 address and a gateway IPv6 address.

Gateway IPv6 address:

2001:DB8:6404::1

Instance IPv6 address:

2001:DB8:6404:10fB:928a:b151:d721:51bc

Best Answer

First of all - Please take a backup of the file 01-netcfg.yaml.

To configure IPv6, you would need to configure the file /etc/netplan/01-netcfg.yaml

sudo nano /etc/netplan/01-netcfg.yaml

From your above code, I have assumed the interface server is using eth0

network:
  version: 2
  ethernets:
    eth0:
      dhcp4: true
      dhcp6: false
      addresses:
        - IPv6-Address/IPv6-Netmask
      nameservers:        
        addresses:
          - 2001:4860:4860::8888
          - 2001:4860:4860::8844
      routes:
          - on-link: true
            to: default
            via: IPv6-Gateway

Replace IPv6-Address/IPv6-Netmask & IPv6-Address/IPv6-Netmask with your ISP provided values.

Save the file & to apply the configurations using

sudo netplan apply

Reboot

sudo reboot now

For Nameservers, I have used Google's Public DNS

  1. 2001:4860:4860::8888
  2. 2001:4860:4860::8844

You can also use Cloudflares DNS

  1. 2606:4700:4700::1111
  2. 2606:4700:4700::1001

In case after reboot the Internet Connection does not work properly in your system, Just revert the file 01-netcfg.yaml & use sudo netplan apply & sudo reboot now

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