> ifnet->if_flags is short and all bit is used.

I long ago ran into that.  It isn't very hard to widen if_flags to
long.  It means either a flag day or versioning a number of kernel
interfaces, but I can't see any way around it; it needs to be done
someday....

As of the version I did it to, the files I needed to touch are

	sbin/ifconfig/ifconfig.c
	sbin/routed/defs.h
	sys/net/bpf.c
	sys/net/if.h
	usr.sbin/cnwctl/cnwctl.c
	usr.sbin/greconfig/greconfig.c

I don't know how close to accurate this set is for -current.  (For that
matter, I'm not certain it's correct to start with; there may be other
programs I don't use which need changes but which I missed.)

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