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To: PRZ <kifah@prz.tu-berlin.de>
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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 04 Dec 2003 20:17:23 -0500
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Subject: Re: Ipsec bridging on FreeBSD
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Kifah Abbad <kifah@prz.tu-berlin.de> writes:

> Hi everyone,
> 
> I am working on my thesis , and i found some difficulties doing some
> tasks of the project on openbsd so i am planning to move to freebsd.I
> want to ask some questions, concerning tasks of the project, and i
> hope someone would confirm or not.
> 
> 1. Does freebsd offer s reasonable way for divert socket? i heard it
> could be done using netgraph...It should be also possible to catch
> ethernet frames (not only IP), since this would be happening on an
> ipsec bridge.
> 
> 2.This brings me to following point: Is there a similar solution for
> ipsec-bridging, like explained in the example of "man brconfig" of
> openbsd?
> 
> 3.IS it possible to do MAC-Adress spoofing on a freeBSD machine?

Sounds like you want the Berkeley Packet Filter.
  http://www.freebsd.org/cgi/man.cgi?query=bpf

Should be available on OpenBSD too, if my memory serves.