Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!usc!ucsd!ucbvax!AQUA.WHOI.EDU!mep
From: mep@AQUA.WHOI.EDU (Michael E. Pare)
Newsgroups: comp.protocols.tcp-ip
Subject: Re:  Smart filtering within a protocol on bridge/router?
Message-ID: <8911161250.AA08448@aqua.whoi.edu>
Date: 16 Nov 89 12:50:42 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 10

3COM/Bridge aloows filtering based on packet content and you can build the
filters using logical operators such as and, or, nor, etc.  To trap these
packets you could start the filter using type 0800 (IP) and then the 
particular info for the exact packets you are trying to filter.  All you
need to know is the format of the packet so you'll know what to enter.
Hope this helps.

Michael Pare 
Woods Hole Oceanographic Institution
Woods Hole, MA 02543