On Wed, Aug 25, 2010 at 09:52:16AM +0200, Nils Cant wrote:
> Hey guys,
>
> not sure if this is a bug or a feature request. It's just something
> we've noticed and are having problems with.
>
> We're using the qemu-kvm lenny-backports package on Debian 5.0.5.
>
> When doing a live migration from the virsh shell, the server in
> question becomes unreachable because the ARP cache on our switches
> still thinks the server is on another port.
>
> As soon as the server sends out some traffic, such as a ping, the
> ARP cache get's updated as expected. If it does nothing, the server
> remains unreachable until the ARP cache expires on the switches. (in
> our case 4 hours)
>
> We would like to be able to do live migration for customer machines
> on which we have no access, so we really need KVM to send out an ARP
> announcement/gratuitous ARP when doing a live migration.
>
> Could anyone tell me if this is a bug in KVM, libvirt, or the debian
> qemu-kvm package? (or if I'm doing something wrong? :-) )
>
qemu sends gratuitous ARP after migration. Check forward delay setting on your
bridge interface. It should be set to zero.
> I've been tcpdumping the bridged network interfaces on the hosts
> while doing the migrate, and couldn't see any ARP broadcasts.
>
> Debian 5.0.5
> Kernel: 2.6.32-bpo.3-amd64
> qemu-kvm 0.12.4+dfsg-1~bpo50+2
> libvirt0 0.7.6-1~bpo50+1
>
> migrate --live testserver qemu+ssh://192.168.1.3/system
>
> Thanks in advance,
>
> Nils
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Gleb.
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