On 14.05.2006, at 21:35, Manuel Bouyer wrote:

> On Sun, May 14, 2006 at 09:03:42PM +0200, Andreas Neth wrote:
>>
>> I'm running NetBSD 3.0 along with xen2, and today I ran into trouble
>> with my setup.
>>
>> Up to now, I had dom0 export a disk via nfs to the domUs. I now
>> charged one of the domU's with being the nfs-server.
>> I have two bridges configured, bridge0 shares an external wm0 with
>> all domUs and bridge1 creates a private lan with dom0's tap0.
>
> Is dom0's tap0 used for something ? You don't need to have an  
> interface
> belonging to dom0 for bridging domUs together.

tap0 is/was used for dhcpd

>> Traffic passing from other physical machines passes just fine to the
>> domU's, but anything between 2 domUs has a delay of about 20 seconds.
>> ICMP works, but does not even show the latency, instead reportint an
>> RTT of 0,4ms.
>> The delay even happens when pinging the domU by itself
>
> You could run tcdump on dom0, to get more details on what's going on

I already did that. Apart from the delay (which does not happen  
always from every machine), I can't see anything unusual.

The packets for the nfs-mount also pass by just fine. (debug mount on  
the nfs-host also shows a successful mount)