Is it possible to set an interface to use both DHCP and a custom MTU size by setting the value in rc.conf?
I tried using the line "eth0="dhcp mtu 9000", but that did not work.
There is a hackish way to do it:
eth0="dhcp" eth0mtu="eth0 mtu 1234" INTERFACES=(lo eth0 eth0mtu)
It is important that eth0mtu is after eth0 in INTERFACES.