From owner-freebsd-questions Thu Jan 18 11:39:34 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id LAA27299 for questions-outgoing; Thu, 18 Jan 1996 11:39:34 -0800 (PST) Received: from Relay1.Austria.EU.net (relay1.Austria.EU.net [192.92.138.47]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id LAA27294 for ; Thu, 18 Jan 1996 11:39:29 -0800 (PST) From: marino.ladavac@aut.alcatel.at Received: from atusks01.aut.alcatel.at by Relay1.Austria.EU.net with SMTP id AA11378 (5.67b/IDA-1.5 for ); Thu, 18 Jan 1996 20:39:22 +0100 Received: from atuhc16 by atusks01.aut.alcatel.at (4.1/SMI-4.1/AAA-1.29/main) id AA23886; Thu, 18 Jan 96 20:38:40 +0100 Message-Id: <9601181938.AA23886@atuhc16.atusks01.aut.alcatel.at> Received: by atuhc16 (1.38.193.4/16.2) id AA17244; Thu, 18 Jan 1996 20:38:39 +0100 Subject: Re: ethernet packet sniffer. To: chuckr@glue.umd.edu (Chuck Robey) Date: Thu, 18 Jan 96 20:38:38 MET Cc: questions@freebsd.org In-Reply-To: ; from "Chuck Robey" at Jan 18, 96 10:34 am Mailer: Elm [revision: 70.85] Sender: owner-questions@freebsd.org Precedence: bulk > Mike, I'm not saying it would be practical, but if her networking > department happens to have a Time Domain Reflectometer, which is common > communications equipment for high speed cables (many cable companies have > one) then every tap can be detected. A TDR would spot everything, even > unused BNC taps. So would a Frequency Domain Reflectometer. Which reminds me: we built one of those for some 20 USD worth of parts (and 5k USD worth of HP signal analyzer, but we had that lying on the bench already; talking about cheap hack :) /Alby