Comment 5 for bug 1905280

Another +1 for this.

A note for others - the systemd-networkd version-237 which comes with Ubuntu 18.04 does not support XFRM in the [netdev] spec. So options seem to be:

A) On Ubuntu 18.04 use a network-dispatcher script (as @adamretter put down)
B) On Ubuntu 18.04 upgrade systemd to gain access to xfrm**
C) Use Ubuntu 20.04 systemd-networkd
D) Hop onto launchpad.net to leave a +1 for netplan to support the explosion of new network features in systemd

**I wanted to see how irksome this would be so I upgraded 237 to 245.4 mostly following these instructions https://gist.github.com/Jiab77/7df6e80804567f6f599b227cf2fafd00
On an AWS t2.micro it took 20 minutes for dpkg to compile everything.