From owner-freebsd-net Sat Oct 16 21:30:57 1999 Delivered-To: freebsd-net@freebsd.org Received: from mail.xmission.com (mail.xmission.com [198.60.22.22]) by hub.freebsd.org (Postfix) with ESMTP id D2DA3150D5 for ; Sat, 16 Oct 1999 21:30:41 -0700 (PDT) (envelope-from wes@softweyr.com) Received: from [204.68.178.39] (helo=softweyr.com) by mail.xmission.com with esmtp (Exim 2.12 #2) id 11chxq-0001nD-00; Sat, 16 Oct 1999 22:30:35 -0600 Message-ID: <38094456.B210ECEC@softweyr.com> Date: Sat, 16 Oct 1999 21:36:54 -0600 From: Wes Peters Organization: Softweyr LLC X-Mailer: Mozilla 4.7 [en] (X11; U; FreeBSD 3.1-RELEASE i386) X-Accept-Language: en MIME-Version: 1.0 To: jonathan michaels Cc: Chris Dillon , ckwen , freebsd-net@FreeBSD.ORG Subject: Re: can two fast ethernet cards work in a freebsd box ? References: <199910161104.TAA26753@eembox.ee.ncku.edu.tw> <19991017090323.A23931@caamora.com.au> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org jonathan michaels wrote: > > On Sat, Oct 16, 1999 at 02:28:56PM -0500, Chris Dillon wrote: > > On Sat, 16 Oct 1999, ckwen wrote: > > > > > > > > Thanks to Wes Peters and Martin Machacek. > > > Now the hub's 100 Mbps LED goes on again after the execution > > > of ifconfig command. The parameters I set in ifconfig are > > > "media 100baseTX mediaopt full-duplex." > > > Neither of them can be omitted. > > > > If this really is a HUB as you have been saying all this time, and not > > a SWITCH, you don't want to be using full-duplex. > > ummm, this may be a silly question, if so would you (or > anybody else) be so kind as to reply off list as to why and > what the difference would be in this regard Full duplex can only be used on a network where there are only two transmitters. Since hubs are a shared resource, connecting multiple transmitters together, you can only use half-duplex. Switches do not have this problem, because each switch port is a single network. As long as you plug only one NIC into each switch port, you can run that one NIC at full duplex. > i've just recently gotten a couple of 100basetx nics for my > three pci based computers and have started to save fro a > 100basetx hub, i was then told that a swithch would be better, > especially if i had lots of collisions. Yes, every machine plugged into a hub is in a shared collision domain. In a switched environment, the collision domain consists of the switch and the host, so there are NO collisions. Even an inexpensive layer 2 switch provides these benefits. > since mving into a new house (700 meters fron teh end of off > and directly down teh middle of off teh middle of one off teh > main runways of sydeny international airport. previously ultra > reliable equipment has becme more than a bit quirky. It may. A switch will regenerate each of the packets, whereas a hub only retransmits them and often will induce small timing errors itself. Unfortunately, even inexpensive switches aren't all that inexpensive. -- "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