Hi, I have a setup where the public traffic travels over a VLAN interface and should have an MTU of 1400 rather than the default 1500. The virtual interfaces seem to respect this setting:
*27: vnet5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc fq_codel master cloudbr0 state UNKNOWN mode DEFAULT group default qlen 1000* However, the interfaces inside the VMs try to use an MTU of 1500. I solved this for user VMs by providing a cloud-init script that sets the MTU, but there seems to be no such possibility for system VMs. How do I set the MTU correctly? -- [image: Nerdalize] Alexander Overvoorde +31 6 20 28 27 29 OR +31 15 30 10 022
