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