From owner-freebsd-questions Thu May 18 23:11:23 2000 Delivered-To: freebsd-questions@freebsd.org Received: from cc942873-a.ewndsr1.nj.home.com (cc942873-a.ewndsr1.nj.home.com [24.2.89.207]) by hub.freebsd.org (Postfix) with ESMTP id 4CA8737BDE7 for ; Thu, 18 May 2000 23:11:19 -0700 (PDT) (envelope-from cjc@cc942873-a.ewndsr1.nj.home.com) Received: (from cjc@localhost) by cc942873-a.ewndsr1.nj.home.com (8.9.3/8.9.3) id CAA66624; Fri, 19 May 2000 02:10:50 -0400 (EDT) (envelope-from cjc) Date: Fri, 19 May 2000 02:10:50 -0400 From: "Crist J. Clark" To: Travis Leuthauser Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Multiple NIC's Message-ID: <20000519021050.A66352@cc942873-a.ewndsr1.nj.home.com> Reply-To: cjclark@home.com References: <017b01bfc0ef$78ad4000$20503cd0@travis> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <017b01bfc0ef$78ad4000$20503cd0@travis>; from travis@winconx.com on Thu, May 18, 2000 at 12:35:34PM -0500 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, May 18, 2000 at 12:35:34PM -0500, Travis Leuthauser wrote: > I am running 3.1 Stable. I am trying to add a 2nd NIC in my news server. I > have a 3com (xl0) currently in it with the following configuration: > > xl0: > IP: xxx.xxx.xxx.12 netmask 255.255.255.128 > alias: xxx.xxx.xxx.14 netmask 255.255.255.255 > both IP's are in the same subnet. Cool. That's the way to go. > I want to add a second 3com NIC (xl1) with the .14 address, thus making my > configuration: > > xl0 xxx.xxx.xxx.12 netmask 255.255.255.128 > xl1 xxx.xxx.xxx.14 netmask 255.255.255.128 Uh-oh... > Both of these will be plugged into a 100Mbit hub for the next week or so > until I get a Catalyst in place. ^^^ Eep! You have two NICs on one host in a collision domain. This can only hurt your network performance. Do not do that. > Now, for the problem, when I add the second NIC and change my configuration > to match the above, I begin getting arp messages such as > > /kernel: arp: xxx.xxx.xxx.12 is on lo0 but got reply from (MAC address of > xl0) on xl1 > /kernel: arp: xxx.xxx.xxx.32 is on xl0 but got reply from > (MAC address of win. 98 box @ .32) on xl1 > > Should I configure the second NIC with a /32 subnet add just add an explicit > route? As long as you have a collision domain, only use one NIC. -- Crist J. Clark cjclark@home.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message