From owner-freebsd-net Tue Jan 4 17:58:44 2000 Delivered-To: freebsd-net@freebsd.org Received: from ind.alcatel.com (postal.xylan.com [208.8.0.248]) by hub.freebsd.org (Postfix) with ESMTP id 3FD6014DAA for ; Tue, 4 Jan 2000 17:58:40 -0800 (PST) (envelope-from wes@softweyr.com) Received: from mailhub.xylan.com (mailhub [198.206.181.70]) by ind.alcatel.com (8.9.3+Sun/8.9.1 (ind.alcatel.com 3.0 [OUT])) with SMTP id RAA05925; Tue, 4 Jan 2000 17:58:07 -0800 (PST) X-Origination-Site: Received: from omni.xylan.com by mailhub.xylan.com (SMI-8.6/SMI-SVR4 (mailhub 2.1 [HUB])) id RAA09791; Tue, 4 Jan 2000 17:58:06 -0800 Received: from softweyr.com (dyn1.utah.xylan.com [198.206.184.237]) by omni.xylan.com (8.9.3+Sun/8.9.1 (Xylan engr [SPOOL])) with ESMTP id RAA19021; Tue, 4 Jan 2000 17:56:56 -0800 (PST) Message-ID: <3872A5E1.8EA69968@softweyr.com> Date: Tue, 04 Jan 2000 19:01:05 -0700 From: Wes Peters Organization: Softweyr LLC X-Mailer: Mozilla 4.7 [en] (X11; U; FreeBSD 3.3-RELEASE i386) X-Accept-Language: en MIME-Version: 1.0 To: Dan Davis Cc: freebsd-net@freebsd.org Subject: Re: sniffing networks References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Dan Davis wrote: > > > According to a friend who has done some network monitoring tests this > > is not as perfect a solution as it sounds. He has observed packets > > coming out ports other than the one where the destination system is > > connected. Still, everyone agrees it's far better than the old > > dozens-of-machines-in-a-single-collision-domain method. > > Perhaps that's because the switch uses a fixed-size table for matching > which destinations should be routed to each ports that is smaller > than the number of destinations/ports actually in use. Since the > switch needs to operate so quickly, is it probable that such a > switching table is actually in silicon or programmed into an FPGA? Yes. The NetGear FS-105 uses a 1K hash on the destination MAC address; this is typical for layer-2 switches. -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC wes@softweyr.com http://softweyr.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message