In my test I modified a multipass launched VM's netplan config to:
multipass@safe-hornet:~$ cat /etc/netplan/50-cloud-init.yaml
# This file is generated from information provided by
# the datasource. Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
ethernets:
ens3:
dhcp4: true
mtu: 1496
match:
macaddress: 52:54:00:4c:5b:ac
set-name: ens3
dhcp4-overrides:
use-mtu: false
dhcp6-overrides:
use-mtu: false
ipv6-mtu: 1284
version: 2
Also disabled cloud-init overwriting it:
multipass@safe-hornet:~$ cat
/etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
network: {config: disabled}
IPv6 MTU is properly set on Eoan after reboot:
multipass@safe-hornet:~$ sysctl net.ipv6.conf.ens3.mtu
net.ipv6.conf.ens3.mtu = 1284
... but not on Disco or Bionic. To be continued...
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https://bugs.launchpad.net/bugs/1671951
Title:
networkd should allow configuring IPV6 MTU
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