Path: utzoo!bnr-vpa!bnr-fos!bigsur!bnrgate!bcara13!fortinp
From: fortinp@bcara13.bnr.ca (Pierre Fortin 1573589)
Newsgroups: comp.dcom.lans
Subject: Re: Smart filtering within a protocol on bridge/router?
Summary: cisco
Message-ID: <188@bnrgate.bnr.ca>
Date: 17 Nov 89 15:32:03 GMT
References: <2598@aecom.yu.edu>
Sender: news@bnrgate.bnr.ca
Lines: 16

In article <2598@aecom.yu.edu>, glen@aecom.yu.edu (Glen M. Marianko) writes:
> Anyone ever hear of a bridge or router that can filter traffic within
> a protocol.  Like tell the box to "filter all TELNET traffic" or
> "allow only SMTP traffic" either globally or for individual nodes.
> Granted, this is rather esoteric - but security is the concept

Check out cisco Systems routers.  They can do just what you want; route
traffic between (sub)nets, bridge other traffic (Hybridge feature) and 
control IP traffic through access control lists which can be set up to 
filter at the address (with mask) level, service and port levels.
For example, you could permit only SMTP traffic from the networks of 
your choice (or even specific users) and deny all the rest.

> -- Glen M. Marianko  Manager, LAN Services  Glasgal Communications, Inc.

Pierre Fortin, Internet Systems, Bell-Northern Research, Ottawa, Canada