Date: Sun, 4 Jan 2004 23:25:15 -0800 From: Luigi Rizzo <rizzo@icir.org> To: "Marc G. Fournier" <scrappy@hub.org> Cc: freebsd-net@freebsd.org Subject: Re: Odd behaviour on em0 device in -stable ... I think ... Message-ID: <20040104232515.A49878@xorpc.icir.org> In-Reply-To: <20040104200204.V28998@ganymede.hub.org>; from scrappy@hub.org on Sun, Jan 04, 2004 at 08:04:34PM -0400 References: <20040104162220.S28998@ganymede.hub.org> <20040104231252.GA71628@pit.databus.com> <20040104200204.V28998@ganymede.hub.org>
next in thread | previous in thread | raw e-mail | index | archive | help
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 <src ip> <dest ip>' 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"
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040104232515.A49878>