Ubuntu 18.04 uses netplan to configure the network. All my servers run behind an OPNSense Firewall that runs a DHCP server for IPv4 and has static leases applied.
Since I don't run a IPv6 DHCP server, I have to configure IPv6 manually on all my servers. I did some research to figure out how to get it working with netplan. And guess what, it is easier than I thought.
- <IPv6 address>
gateway6: <IPv6 gateway address>
I think the setup is pretty self explainary but let me explain it to you. First we enable dhcp for IPv4 and disable dhcp for ipv6.
In the last step we apply the fixed ipv6 address and save the file. After a reboot, the server should have the correct ip addresses. Terms