Thank you for this bug report. I agree the validation should be less restrictive here and netplan should be adopted to support those newer systemd-networkd features.
I've drafted a potential fix in this PR: https://github.com/canonical/netplan/pull/274 ** No longer affects: ubuntu ** Changed in: netplan Status: New => Triaged ** Changed in: netplan Importance: Undecided => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1966476 Title: Netplan does not provide "key" parameter to GRE tunnel configuration via systemd-networkd To manage notifications about this bug go to: https://bugs.launchpad.net/netplan/+bug/1966476/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs