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... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1671951 Title: networkd should allow configuring IPV6 MTU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1671951/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs