MTU on VLAN sub interface for WAN

[mikey_s]

I have dual WAN setup and the backup WAN has a lower MTU value. At present the WAN connections are plugged into different interfaces on the firewall.

I see I can modify the MTU size of a VLAN interface, therefore is it possible to have MTU of 1500 on the parent interface and then a VLAN with a lower value for the second WAN interface?

In my case 1500 and 1380

[stephenw10]

Yes that should be possible. Though the code handling it was reviewed recently. It works as expected in 26.03.

[mikey_s]

@stephenw10 thank you, will test, currently running 26.03