Re: [Xen-users] Virtual machine not found by network

[Tapas Mishra <mightydreams@xxxxxxxxx>]

have you enabled IP forwarding on Dom0
/etc/sysctl.conf

On Thu, May 27, 2010 at 10:46 PM, Lippert, Kenneth B.
<Kenneth.Lippert@xxxxxxxxx> wrote:
> Crap.
>
> Disabling AppArmor didn't help, still broken.  Put external machine's
> crontab ping to every minute.  We'll see what happens now.
>
> Sorry for the many messages.
>
> -k
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Lippert,
> Kenneth B.
> Sent: Thursday, May 27, 2010 11:53 AM
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] Virtual machine not found by network
>
> Another update.....
>
> Novell's AppArmor WAS enabled on the domU.   I disabled it, stopped all
> the pinging cron jobs, and have not had a failure since.
>
> Could that have been the problem?
>
> Thanks,
> -k
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Lippert,
> Kenneth B.
> Sent: Thursday, May 27, 2010 11:13 AM
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] Virtual machine not found by network
>
> Rainer,
>
> Thank you for your reply.
>
> No, no firewall running on the domU.
>
> No other machine with same IP (although there USED to be, we did some IP
> switching when this domU went to production mode several days ago).  The
> domU's old IP is now the dom0's (and vice versa).  We did this so that
> outside clients that attached to 123.456.8.2 wouldn't have to change
> anything in their /etc/hosts, etc.).
>
> Update on my original email.  The pinging from the domU to the outside
> didn't actually help.  What DOES help is another machine on the same
> LOCAL net pinging the domU every 5 minutes.  I have not had a failure
> since that started.
>
> Are there XEN bridge settings that define how to respond to
> "arp-who-has" requests?  Certainly sounds like that is the problem.
>
> -k
>
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Rainer
> Sokoll
> Sent: Thursday, May 27, 2010 10:51 AM
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Virtual machine not found by network
>
> On Thu, May 27, 2010 at 09:48:06AM -0400, Lippert, Kenneth B. wrote:
>
>> The gateway is defined in both to be 123.456.8.254.
>>
>> My virtual machine builds fine, and all seems well, but if the domU is
>> inactive for a period of several minutes, with no network traffic, it
>> seems the gateway forgets how to get to it.   This is manifested by
>> other machines on the local 123.456.8.* network being able to ping and
>> get to the domU, but machines OUTSIDE the local net cannot.  It is not
> a
>> DNS problem , pings from 123.456.22.1 (for instance) fail even if the
> IP
>> of the domU is specified (not just its name).
>
> Sounds like the gateway 123.456.8.254 forgot the mac address of your
> domU.
> Do you have some weired firewall running on your domU blocking
> arp-who-has?
> Another machine with the same IP in the same broadcast domain?
>
> Rainer
>
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-- 
Tapas

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