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Date:      Thu, 04 May 2006 16:48:01 +0100
From:      Gavin Atkinson <gavin.atkinson@ury.york.ac.uk>
To:        "Marc G. Fournier" <scrappy@hub.org>
Cc:        Rutger Bevaart <rutger.bevaart@illian-networks.nl>, freebsd-stable@freebsd.org
Subject:   Re: em(4) device still 'freezes' on latset CVSup'd 6.x ...
Message-ID:  <1146757681.4321.37.camel@buffy.york.ac.uk>
In-Reply-To: <20060504122704.B1147@ganymede.hub.org>
References:  <20060504070534.98F0216A432@hub.freebsd.org> <A7201732-7F1A-45B1-98DF-003303A0DBAF@illian-networks.nl> <20060504112918.Q1147@ganymede.hub.org> <1146754236.4321.26.camel@buffy.york.ac.uk> <20060504122704.B1147@ganymede.hub.org>

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On Thu, 2006-05-04 at 12:27 -0300, Marc G. Fournier wrote:
> On Thu, 4 May 2006, Gavin Atkinson wrote:
> 
> > On Thu, 2006-05-04 at 11:30 -0300, Marc G. Fournier wrote:
> >> On Thu, 4 May 2006, Rutger Bevaart wrote:
> >>
> >>> Technically it's not routes that are not being updated, but a stale
> >>> (outdated) ARP cache on the other hosts. The system with the new alias'ed IP
> >>> needs to do a gratuitous ARP (broadcast ARP for it's own IP). As an
> >>> intermediate solution you could flush the ARP cache on the hosts with stale
> >>> cache (usually a router or L3 switch on the subnet).
> >>
> >> This is what we end up having to do ... but, unfortunately, that means
> >> getting ahold of our co-lo provider and asking them to do it ... they have
> >> always been most accomodating, its just one of those things that I
> >> shouldn't *have* to do :(
> >
> > ... or use ports/net/arping:
> >
> > arping -S <new IP> -s <your-MAC> router-IP
> >
> > But, I agree, this is a bug with em(4) that should probably be fixed at
> > some point...
> 
> I will try that later tonight, thanks ... I have another one to move onto 
> that machien from another one :)

It's been a while since I've needed to do it, so that command line is
from memory.  You may need to use -T and/or -B instead of the router IP
address.

Gavin



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