Here is a patch[1] that will allow the MTU to be set higher than 1500 on
a tap(4) interface. I ran into the need to do this when I had em0 set
to 9000 and tried to bridge em0 with tap0 (MTU 1500) for QEMU. A bridge
interface will not allow interfaces with different MTU's to be added to
it.
Since I have touched little inside the kernel, I thought it best if
others take a look at it first.
Sean
1. http://people.freebsd.org/~scf/if_tap-SIOCSIFMTU.patch
--
s...@freebsd.org
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