From owner-freebsd-net@FreeBSD.ORG Fri Jun 24 22:42:46 2005 Return-Path: X-Original-To: freebsd-net@freebsd.org Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id AF52316A41C for ; Fri, 24 Jun 2005 22:42:46 +0000 (GMT) (envelope-from greg@qwest.net) Received: from mail.oss.uswest.net (mail.oss.uswest.net [204.147.85.136]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7032843D49 for ; Fri, 24 Jun 2005 22:42:46 +0000 (GMT) (envelope-from greg@qwest.net) Received: from psv.rowes.org (rrcs-24-173-162-118.se.biz.rr.com [24.173.162.118]) by mail.oss.uswest.net (8.13.1/8.13.1) with ESMTP id j5OMggfi043357; Fri, 24 Jun 2005 17:42:42 -0500 (CDT) (envelope-from greg@qwest.net) Received: from localhost.rowes.org (localhost.rowes.org [127.0.0.1]) by psv.rowes.org (8.13.1/8.12.9) with ESMTP id j5OMgwTH029929; Fri, 24 Jun 2005 18:42:58 -0400 (EDT) (envelope-from greg@qwest.net) From: Greg Rowe Organization: Qwest Wireless, L.L.C. To: freebsd-net@freebsd.org, Vlad GALU Date: Fri, 24 Jun 2005 18:42:57 -0400 User-Agent: KMail/1.7 References: <200506241812.07076.greg@qwest.net> <79722fad050624151524700a27@mail.gmail.com> In-Reply-To: <79722fad050624151524700a27@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200506241842.57903.greg@qwest.net> X-DCC-Qwest.net-Metrics: mail.oss.uswest.net 1209; Body=2 Fuz1=2 Fuz2=2 X-oss.uswest.net-MailScanner-Information: Please contact mpls_syseng for more information X-oss.uswest.net-MailScanner: Found to be clean of viruses X-oss.uswest.net-MailScanner-SpamCheck: not spam, SpamAssassin (score=0.086, required 11, autolearn=spam, AWL 0.04, FORGED_RCVD_HELO 0.05) Cc: Subject: Re: Looking For Ideas or Suggestions X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: greg@qwest.net List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Jun 2005 22:42:46 -0000 On Friday 24 June 2005 06:15 pm, Vlad GALU wrote: > On 6/25/05, Greg Rowe wrote: > > Greetings, > > I've been chasing a network interface "freeze" problem on and off for > > some time now and it's driving me nuts ! > Are you sure that's not your catalyst forgetting about the MAC of > the machine ? Or the MAC expiring from the ARP table of your router ? > Are you experiencing unicast floods while this phenomena is happening > ? No unicast floods that I can see using ethereal. These systems are part of a larger cluster of servers, both Solaris and FreeBSD, so I have a number of other systems besides these on that Catalyst and routers. All the systems have multiple interfaces for both external and internal system to system traffic. These two systems are the only ones having the issue. > I suppose your default route is through em1. Try sending the > responses to packets that arrive on em0/fxp0 on the very interfaces > they arrived on. You can do that with any of the packet filters > FreeBSD has. It should pretty much take care of your issue. > I suppose this is what happens: a requests comes on fxp0, the > machine sends the reply back via em1. I'm pretty sure your catalyst > forgets the MAC of fxp0. The default route is em0. Inbound mail comes in through that interface, is processed, and then is sent to other systems that reside on the em1 network segment (different network). Looking at the TCP sessions, the traffic appears to stay on the proper LAN. I'll double verify this though. Thanks -- Greg Rowe Qwest Wireless, L.L.C. "The telephone, for those of you who have forgotten, was a commonly used communications technology in the days before electronic mail. They're still easy to find in most large cities." -- Nathaniel Borenstein