[Xen-users] Automatically broadcast arp during a live migration.

["Michael Marineau" <mike@xxxxxxxxxxxx>]

I am using Xen 3.0.4 on Gentoo. During a vm migration there is not an
automatic arp broadcast to notify the switch the vm has changed
network ports. This is not an issue if the vm is sending traffic at
the time or another system sends an arp broadcast requesting the
address for the vm. Both of which will cause the switch to update
which port the vm is on. However if neither of those things happen all
traffic to the vm will stall.

An easy way to demonstrate this is to start arping (from somewhere
other than the destination dom0) before the migration, ie:
arping <vm ip address>
As soon as the migration finishes pings will stop.

An easy workaround is to do the same thing, but broadcast all pings so
the switches arp cache doesn't prevent the delivery of the ping.
arping -b <vm ip address>

So my questions are:
Is Xend supposed to handle this issue automatically but for some reason is not?
And if it isn't supposed to is there a good place to hook this into
Xend so it does handle it?

--
Michael Marineau
Oregon State University
mike@xxxxxxxxxxxx

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