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 From:  Andrew Lewis <andrew at coastal dot com>
 To:  Christiaens Joachim <jchristi at oce dot be>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] IDS integration w/m0n0wall?
 Date:  Fri, 27 Feb 2004 16:08:29 -0500
Christiaens Joachim wrote:
> Would a simple tap-'device' work in this situation?
> Where you just connect the RX pair of a nic in your IDS box parrallel to
> your RX pair on the m0n0, and this for each interface? Don't know about
> impedance etc, but this should be possible someway (optocouplers?), and safe
> to 'go around' the firewall this way, since the interfaces cannot be used to
> transmit anything...

If you're only interested in half of the conversation.

A typical tap has four ports.  One for each node and two for the 
IDS/sniffer.

http://www.netoptics.com/