rev 1.13 fixed the MTU ioctl handler to allow adjusting the MTU but it seems Jumbo support is broken, so disable Jumbos for now.
rev 1.13 fixed the MTU ioctl handler to allow adjusting the MTU
but it seems Jumbo support is broken, so disable Jumbos for now.

issue reported by jolan@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars