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

["Zhu Han" <schumi.han@xxxxxxxxx>]

On 7/5/07, Graham, Simon <Simon.Graham@xxxxxxxxxxx> wrote:
> Whilst I might agree that from a purist point of view having netfront do this 
> is a violation of layering, it's already accepted in some other upstream 
> drivers -- bonding for example; this virtual network interface driver will send 
> gratuitous ARPs for the IP address associated with the bond and for any VLANs 
> layered directly on top of the bond when failing over (it just wont send ARPs 
> for things above the bridge if it is plugged into a bridge).
I guess the user mode helper should be inside DOM0 unless you wanna
ask the user to intall some extra tools as vmware does, considering
about HVM domain.

The user mode helper in DOM0 should watch the connect status between
netback and netfront. If it becomes connected, then sends out an fake
ethernet frame, not an fake arp reply because you can't know the IP
address.

Xentore can provide the mac address of netfront but netfront has to
register set_mac_address method to update it when the user try to
modify it.

> Simon
>
> > -----Original Message-----
> > From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxxxxx]
> > Sent: Thursday, July 05, 2007 3:46 PM
> > To: Graham, Simon
> > Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] Stimulating domains to send gratuitous ARPs
> >
> > On Thu, 2007-07-05 at 14:41 -0400, Graham, Simon wrote:
> > > I accept that this is not very nice and we should probably have a
> > more
> > > organized/documented way to do this but I'm not sure what would be
> > > appropriate; any suggestions?
> >
> > A usespace tool to send such an ARP would be a very useful thing to
> > have, if it doesn't already exist.
> >
> > The gratuitous arping in netfront is not very popular with the upstream
> > Linux folks so this functionality is not in the paravirt_ops patches
> > which are going upstream, so we'd need such a tool in the end anyway.
> >
> > Ian.
> >
> >
> >
> >
>
>
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--
best regards,
hanzhu

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