RE: [Xen-devel] Stimulating domains to send gratuitous ARPs

["Graham, Simon" <Simon.Graham@xxxxxxxxxxx>]

> 
> Stephen Hemminger posted a patch to add this capability generically so
> it wouldn't be a netfront-specific piece of behaviour.  I have not
> submitted it for upstream yet, mainly because nobody has
> confirmed/tested that it really does what we need.  But it looks
> reasonable, and it should be accepted once we confirm its correct.
> 

-sigh- ... doesn't really help unfortunately for a couple of reasons:

0. It's in some as yet unreleased kernel version -- doesn't help with backlevel 
DomUs
1. You still have to configure this in every DomU since the default is to not 
do it.
2. There's no way to stimulate this from Dom0 as needed (e.g. at the end of 
migration
   or when some other change occurs in Dom0).

Right now, I'm experimenting with a solution that sends an invalid broadcast 
RARP frame... if this works for me, it'll also work for the migration/resume 
case...

Simon

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