Re: [Xen-users] domU loses incoming network after period of inactivity

[Martin GombaÄ <martin@xxxxxx>]

Matthew L.,

replacing the switch might be a solution. If it works for you, please 
let us all know.
Tnx.

M.

Fajar A. Nugraha wrote:
> On Wed, Feb 17, 2010 at 6:49 AM, Matthew Law <matt@xxxxxxxxxxxxxxxxxx> wrote:
>   
> > > A workaround is to ping gateway from crontab, each minute. But this
> > > won't help you from loosing connection to other machines on the same
> > > network. :-/
> > >       
>   
> > Oh, dear :-(
> >
> > I have to use bridged for most domUs, so routed is not an option for me
> > either.  Did you try posting it in the xen developers list? - surely
> > something as serious as this is being or has been addressed...
> >     
> At first glance it looks like switch problem. You should be able to
> trace it when the problem occurs:
> - ping from outside host
> - "brctl showmacs name_of_bridge", see if domU MAC is listed there
> - tcpdump on uplink interface (usually peth0), see if arp goes through
> correctly and domU replies it
> - look at mac address table on the switch, see if you can find domUs
> MAC on the correct port
>
> It might be that the switch who should be doing arp broadcast to all
> port when a MAC is not cached didn't do that, so the request from
> outside world to domU never reach dom0's port.
>
>   
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