Knowledgebase

How to add IPv6 to Ubuntu 24.04 or later using netplan.

On Ubuntu 24.04, network configuration is managed by netplan. To enable IPv6 on your interface, you need to edit the YAML configuration file under /etc/netplan/.

Usually you will find a .yaml file inside /etc/netplan/. Open it with your editor, for example: 50-cloud-init.yaml

sudo nano /etc/netplan/50-cloud-init.yaml

You will find its content similar to this:

network:
  version: 2
  ethernets:
    interface0:
      match:
        macaddress: "00:11:12:aa:bb:cc"
      addresses:
        - "192.168.1.10/24"
      nameservers:
        addresses:
          - 8.8.8.8
          - 8.8.4.4
      routes:
        - to: "default"
          via: "162.220.24.1"
          on-link: true

Edit the file to add:

• an IPv6 address in the addresses section,
• an IPv6 gateway under the routes section,
• and an IPv6 nameserver under the nameservers section.

For example:

network:
  version: 2
  ethernets:
    interface0:
      match:
        macaddress: "00:11:12:aa:bb:cc"
      addresses:
        - "192.168.1.10/24"
        - "fd12:3456:789a::ac58/64"
      nameservers:
        addresses:
          - 8.8.8.8
          - 8.8.4.4
          - 2001:4860:4860::8888
      routes:
        - to: "default"
          via: "162.220.24.1"
          on-link: true
        - to: "::/0"
          via: "fd12:3456:789a::1"
          on-link: true

Replace fd12:3456:789a::1 with your actual IPv6 gateway, and fd12:3456:789a::ac58/64 with your actual IPv6 address and prefix.

Then apply the changes with:

sudo netplan apply

Your system should now have both IPv4 and IPv6 connectivity.