See comment #20; ipv6 mtu is 1280 -> DEVICE_MTU.
I'm testing something in the middle now.
On Eoan with:
network:
version: 2
ethernets:
ens3:
addresses: [10.5.0.16/16]
gateway4: 10.5.0.1
dhcp4: false
match:
macaddress: fa:16:3e:c9:1e:fb
mtu: 8958
ipv6-mtu: 8960
set-name: ens3
nameservers:
addresses: [10.5.0.2]
search: [project.serverstack]
It works. Now on bionic-proposed, it does not.
Aug 28 16:59:56.659125 b-test-ipv6-mtu systemd-networkd[1149]:
/run/systemd/network/10-netplan-ens3.network:11: Unknown lvalue 'IPv6MTUBytes'
in section 'Network'
So, looks like bionic systemd is missing something.
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https://bugs.launchpad.net/bugs/1671951
Title:
networkd should allow configuring IPV6 MTU
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