On the Discovery network, we automatically configure IPv4 but sometimes to enable IPv6, Netplan needs some tweaks. In Ubuntu NVMe VPS instances, Netplan is used to configure the network and the networking details are provided to the instance using Cloud-init. On Ubuntu instances, we run scripts at startup to automatically add static routes to the gateway. This does not include IPv6 on older OS images.
Get IP Information
In the client area, you can see your IPv6 network information. Navigate to Services > My Services and select your instance. You will need the IPv6 Address and gateway to add to the Netplan configuration files.
Enable IPv6 in Netplan Configuration
Inside the /etc/netplan folder you will find the 50-cloud-init.yaml file. This contains all of the networking information from Cloud-init. Here to enable IPv6 we will make some changes to the default configuration. The file will look like this;
network:
version: 2
ethernets:
eth0:
addresses:
- 198.119.95.93/25
gateway4: 10.10.19.117
match:
macaddress: ea:7f:f6:2a:cd:01
nameservers:
addresses:
- 213.133.99.99
- 213.133.98.98
- 213.133.100.100
search:
- f2h.cloud
set-name: eth0
In some files, you may see an IPv6 address in the Netplan file. This is normal. So, we need to edit the file to specify our IPv6 information. It’s important that you do not use tab in the Netplan file. Only use the spacebar to create spaces and ensure the spaces remain in place.
network:
version: 2
ethernets:
eth0:
addresses:
- 198.119.95.93/25
- 2001:41d0:800:2c78::87c6/120
gateway4: 10.10.19.117
routes:
- on-link: true
to: ::/0
via: 2001:21d0:100:2cff:1
match:
macaddress: ea:7f:f6:2a:cd:01
nameservers:
addresses:
- 8.8.8.8
- 8.8.4.4
- 2001:4860:4860::8888
search:
- f2h.cloud
set-name: eth0
So, in this file, we have added the IPv6 address to the Netplan file and specified a route to the IPv6 gateway. You do not specify the IPv6 gateway. We have also included IPv6 nameservers. Finally, to enable IPv6 Netplan Save and close the file and test the configuration with netplan try and if all is well issue netplan apply. IPv6 will now function.
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