From owner-freebsd-stable Fri Dec 20 14:47:24 2002 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7AF8537B401 for ; Fri, 20 Dec 2002 14:47:22 -0800 (PST) Received: from mta02-svc.ntlworld.com (mta02-svc.ntlworld.com [62.253.162.42]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7FBA043EDC for ; Fri, 20 Dec 2002 14:47:21 -0800 (PST) (envelope-from redjupiter@ntlworld.com) Received: from ntlworld.com ([80.6.108.116]) by mta02-svc.ntlworld.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with ESMTP id <20021220224720.GERJ14589.mta02-svc.ntlworld.com@ntlworld.com>; Fri, 20 Dec 2002 22:47:20 +0000 Message-ID: <3E039DF6.7020706@ntlworld.com> Date: Fri, 20 Dec 2002 22:47:18 +0000 From: redjupiter User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.1) Gecko/20021220 X-Accept-Language: en-us, en MIME-Version: 1.0 To: "Scott M. Nolde" Cc: David Wolfskill , freebsd-stable@FreeBSD.ORG Subject: Re: fxp0 device - Intel NIC References: <200212201615.gBKGF7IB016865@bunrab.catwhisker.org> <3E039092.2030609@ntlworld.com> <20021220215907.GE67177@smnolde.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Scott M. Nolde wrote: >redjupiter(redjupiter@ntlworld.com)@2002.12.20 21:50:10 +0000: > > > > >>HI Again, >> >>Sorry, was dragged out to continue christmas shopping by the wife :-) >> >>OK, I guess I can do that. My understanding was that each NIC has its >>own unique MAC address and not two cards may have the same address. so >>what you are saying now is that it's ok as long as they are on different >>networks. I never understood it that way. >> >>I also understood that the MAC address is hard wired, i.e builtin in the >>card. I know I sound confused, I don't just want to do it but I want to >>understand it as well. I know some cards on soem embedded systems >>have/must have the last three digits to be unique and so the programmer >>is allowed to assign his own first three digits. >> >>Sorry to dwell on this but I really want to understand it. >> >>thanks. >> >> > >The MAC address must be unique to the network, as mentioned before, as the >MAC address on a packet is only good until the next router, when it's >changed for the next hop. You are correct in that the MAC is hardcoded, >but that does not mean that you can't override it in software (which is >what is suggested). More technical info can be found in any book >explaining how TCP/IP works. > >Go ahead and try it... change the MAC to that of the realtek with the >/etc/start_if.fxp0 file and see how it works. > > Hi again, It works jolly good. I did what you said and then reversed the calls in rc.conf and swapped the cables of course (the second time that is ;-) ) and hey presto. Thank you all. I actually learned something, and this has never occured to me :-) thanks To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message