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Date:      Mon, 23 Jun 1997 10:04:05 -0500
From:      Edwin Culp <eculp@emprende.net.mx>
To:        spork <spork@super-g.com>
Cc:        chas <sweeting@tm.net.my>, freebsd-isp@FreeBSD.ORG
Subject:   Re: duplicate IP = security problem ?
Message-ID:  <33AE9065.D8C0E83@mexcom.net>
References:  <Pine.BSF.3.95q.970622202913.12939B-100000@super-g.inch.com>

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spork wrote:
> 
> >
> > ---------------------------------------------------------------
> >
> > So, my questions are :
> >
> > 1) Could it be possible for someone to be using our IP ?
> >    And hence be on our network ?
> > 2) What could I do if this happens again to gain control
> >    of the IP again ?
> > 3) Any other explanations or advice ?
> >
> > Thank you very much.
> >
> > chas
> >
I'm attaching a c program that is supposed to spoof your name server
and temporarily substitute it.  I have only scanned the code but
the concept is interesting.  

I had this and the the package that goes with the README.gz (second
attachment) dumped on one of my linux machines in an attempt to do
something that I probably wouldn't have liked. :-)

I think these are worth looking at.  

Ed

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