>One more thing, -CURRENT will stuff two copies of any broadcast into bpf, 
>it seems.

This is because if_simloop() is broken.  I proposed to un-break it
a while ago and never got any feedback.

http://www.FreeBSD.org/cgi/getmsg.cgi?fetch=198310+201485+/usr/local/www/db/text/2001/freebsd-net/20010429.freebsd-net

http://people.freebsd.org/~fenner/if_simloop_callers.html

I've been meaning to just commit my patch, even though it leaves
the callers whose BPF answers are "YES/NO" in that table in the
lurch -- but they're in the lurch anyway because if_simloop uses
DLT_NULL and that's almost never right.

  Bill

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