From owner-freebsd-net@FreeBSD.ORG Sun Jan 4 23:25:44 2004 Return-Path: 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 701C616A4CE for ; Sun, 4 Jan 2004 23:25:44 -0800 (PST) Received: from xorpc.icir.org (xorpc.icir.org [192.150.187.68]) by mx1.FreeBSD.org (Postfix) with ESMTP id C2D4243D58 for ; Sun, 4 Jan 2004 23:25:20 -0800 (PST) (envelope-from rizzo@icir.org) Received: from xorpc.icir.org (localhost [127.0.0.1]) by xorpc.icir.org (8.12.9p1/8.12.8) with ESMTP id i057PIZv049938; Sun, 4 Jan 2004 23:25:18 -0800 (PST) (envelope-from rizzo@xorpc.icir.org) Received: (from rizzo@localhost) by xorpc.icir.org (8.12.9p1/8.12.3/Submit) id i057PGHZ049937; Sun, 4 Jan 2004 23:25:16 -0800 (PST) (envelope-from rizzo) Date: Sun, 4 Jan 2004 23:25:15 -0800 From: Luigi Rizzo To: "Marc G. Fournier" Message-ID: <20040104232515.A49878@xorpc.icir.org> References: <20040104162220.S28998@ganymede.hub.org> <20040104231252.GA71628@pit.databus.com> <20040104200204.V28998@ganymede.hub.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <20040104200204.V28998@ganymede.hub.org>; from scrappy@hub.org on Sun, Jan 04, 2004 at 08:04:34PM -0400 cc: Barney Wolff cc: freebsd-net@freebsd.org Subject: Re: Odd behaviour on em0 device in -stable ... I think ... X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 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, 05 Jan 2004 07:25:44 -0000 i am partly lost on the details of your specific question, but the symptoms do seem to suggest a stale ARP entry, which must be in the router (if the switch had a stale entry in its MAC forwarding table, you would have problems even with local pings, not only remote ones). It is the OS that generates a gratuitous ARP every time you assign an IP address (or alias) to a card, though i am not sure if it sends one for each address assigned to the card, or just one for the newly configured address -- the latter would not solve your problem. cheers luigi On Sun, Jan 04, 2004 at 08:04:34PM -0400, Marc G. Fournier wrote: > On Sun, 4 Jan 2004, Barney Wolff wrote: > > > On Sun, Jan 04, 2004 at 04:31:41PM -0400, Marc G. Fournier wrote: > > > > > > The problem is that I want to move an IP from one of the other servers > > > (all with fxp interfaces) over to the 4th, with the em device ... I -alias > > > the IP from the fxp device, and alias it over to the em device, and I can > > > no longer access it remotely ... > > > > > > If I alias it onto any of hte other two fxp based servers, it works fine. > > > > Something, either the switch or the router, has a stale arp table entry. > > It's a little curious that this ever works, without resetting whatever > > it is. Perhaps the fxp's manage to send a gratuitous arp when taking > > on a new alias. > > re: gratuitous arp ... I was wondering if the nics do anything like this, > but, shouldn't be 'ping -S ' not "force" something? > Like, I could see remote pings not being able to find their way, but > sourcing one of the IP in question to go out, I would have thought it > would have found its way ... > > Would the arp thing be nic based, or does the OS itself do it? > > ---- > Marc G. Fournier Hub.Org Networking Services (http://www.hub.org) > Email: scrappy@hub.org Yahoo!: yscrappy ICQ: 7615664 > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"