From owner-freebsd-net@FreeBSD.ORG Mon Jan 21 19:20:09 2008 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 611A716A418 for ; Mon, 21 Jan 2008 19:20:09 +0000 (UTC) (envelope-from tom@tomjudge.com) Received: from s200bog10.obsmtp.com (s200bog10.obsmtp.com [207.126.150.124]) by mx1.freebsd.org (Postfix) with SMTP id 3615913C47E for ; Mon, 21 Jan 2008 19:20:07 +0000 (UTC) (envelope-from tom@tomjudge.com) Received: from source ([217.206.187.80]) by eu2sys200bob010.postini.com ([207.126.147.11]) with SMTP; Mon, 21 Jan 2008 19:20:06 UTC Received: from bill.mintel.co.uk (bill.mintel.co.uk [10.0.0.89]) by rodney.mintel.co.uk (Postfix) with ESMTP id 8665018141E for ; Mon, 21 Jan 2008 19:20:06 +0000 (GMT) Message-ID: <4794F065.5070800@tomjudge.com> Date: Mon, 21 Jan 2008 19:20:05 +0000 From: Tom Judge User-Agent: Thunderbird 2.0.0.6 (X11/20071022) MIME-Version: 1.0 To: freebsd-net@freebsd.org References: <001b01c85c0f$6ca051d0$1e01c80a@John> <4794703A.4020801@FreeBSD.org> <4794CC56.2030802@tomjudge.com> <20080121174818.GA11928@verio.net> In-Reply-To: <20080121174818.GA11928@verio.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: help X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jan 2008 19:20:09 -0000 David DeSimone wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Tom Judge wrote: >>>> my question is how to configure 2 nics with different ip on same >>>> box in the same subnet. >>> Configure the second with a /32 prefix (netmask 255.255.255.255) >>> instead of the usual netmask. >> Surely this configuration will cause all the reply's to be routed out >> of re0 without some form of pfil layer manipulation? > > If both nic's are connected to the same broadcast domain, what > difference does it make which nic sends the traffic? > This could cause some arp related issues at the other end? What if the remote end point updates its arp entry because it thinks the remote endpoints address has changed (as it has a direct route to the network i.e. it has an IP in 10.200.1/24). It may be worth the original OP investigating if_lagg as it may provide some better solutions. Tom