From owner-freebsd-questions Fri Dec 13 21:45:18 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CCFAC37B401 for ; Fri, 13 Dec 2002 21:45:16 -0800 (PST) Received: from wantadilla.lemis.com (wantadilla.lemis.com [192.109.197.80]) by mx1.FreeBSD.org (Postfix) with ESMTP id 032F943E4A for ; Fri, 13 Dec 2002 21:45:15 -0800 (PST) (envelope-from grog@lemis.com) Received: by wantadilla.lemis.com (Postfix, from userid 1004) id AF80A5194B; Sat, 14 Dec 2002 15:45:53 +1030 (CST) Date: Sat, 14 Dec 2002 15:45:53 +1030 From: Greg 'groggy' Lehey To: Tillman Cc: FreeBSD Mailing List Subject: Re: Hubs and switches (was: uninformed qstn...) Message-ID: <20021214051553.GJ503@wantadilla.lemis.com> References: <20021213060718.GA8054@tao.thought.org> <20021214034131.GH503@wantadilla.lemis.com> <20021213214850.D9342@seekingfire.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20021213214850.D9342@seekingfire.com> User-Agent: Mutt/1.4i Organization: The FreeBSD Project Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.FreeBSD.org/ X-PGP-Fingerprint: 9A1B 8202 BCCE B846 F92F 09AC 22E6 F290 507A 4223 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Friday, 13 December 2002 at 21:48:50 -0600, Tillman wrote: > On Sat, Dec 14, 2002 at 02:11:31PM +1030, Greg 'groggy' Lehey wrote: >> I've seen little difference. But DON"T BUY A HUB! Buy a switch >> instead. They'll give you better performance, and they hardly cost >> any more. > > Great advice. It looks like Cisco has even stopped listing hubs for sale > - layer two switching seems to firmly in control these days :-) > >> I have three switches in my network: a Cisco 2900 (24 ports), a >> Netgear FS105 (5 ports) and a D-Link DSS-8+ (8 ports), in rapidly >> decreasing order of cost. I've never had any trouble with any of >> them. It's possible that the cheap switches might have trouble with >> sustained throughput: an 8 port 100 Mb/s switch can theoretically be >> confronted with a load of 800 Mb/s. I believe the D-Link can do this >> speed, though I can't find the docco. No 100 Mb/s hub will have a >> bandwidth of more than 100 Mb/s, however, and even that is limited by >> collisions. > > It's even worse than that. With full duplex being common, that switch > could theoretically have to cope with 1600Mb/s. Not really. I had already taken that into account. With half duplex, only half of the ports can be sending at any one time :-) > For $50, the fact that they do so fairly reliably is amazing. Yes, I'm quite impressed too. Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message