Xen users - Jun 2006 - arping between two xen0 works, ping doesn''t (not checksum issue)

I have two Xen 3.0.2 domains, both are using network-bridge, both 
servers are in the same network.

dom0_A, domU_A - first Xen server (dom0 and domU)
dom0_B, domU_B - first Xen server (dom0 and domU)

I cannot ping or connect from one dom0_A to dom0_B nor domU_B. arping 
works fine though.

I can ping and connect from domU_A to dom0_B and domU_B, though.


I have changed 
xen-3.0.2-2/linux-2.6-xen-sparse/drivers/xen/netback/interface.c to fix 
the checksum problem.

The other thing I changed in /etc/xen/scripts/network-bridge on one Xen 
server was to change the MAC address of the bridge to fa:ff:ff:ff:ff:ff, 
- without this, two Xen servers had the same MAC address of the bridge 
(fe:ff:ff:ff:ff:ff), which made communication between two Xen domains 
impossible.

Anyone can help?


-- 
Tomasz Chmielewski
http://wpkg.org

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Tomasz Chmielewski wrote:
> I have two Xen 3.0.2 domains, both are using network-bridge, both 
> servers are in the same network.
> 
> dom0_A, domU_A - first Xen server (dom0 and domU)
> dom0_B, domU_B - first Xen server (dom0 and domU)
> 
> I cannot ping or connect from one dom0_A to dom0_B nor domU_B. arping 
> works fine though.
> 
> I can ping and connect from domU_A to dom0_B and domU_B, though.
> 
> 
> I have changed 
> xen-3.0.2-2/linux-2.6-xen-sparse/drivers/xen/netback/interface.c to fix 
> the checksum problem.
> 
> The other thing I changed in /etc/xen/scripts/network-bridge on one Xen 
> server was to change the MAC address of the bridge to fa:ff:ff:ff:ff:ff, 
> - without this, two Xen servers had the same MAC address of the bridge 
> (fe:ff:ff:ff:ff:ff), which made communication between two Xen domains 
> impossible.
A quick answer to myself: I changed the MAC of the bridge of the other 
server, too, to fc:ff:ff:ff:ff:ff (in /etc/xen/scripts/network-bridge), 
and now I can connect both ways, so the problem is solved.

There should be some info on this in the documentation IMHO.


-- 
Tomasz Chmielewski

Software deployment with Samba
http://wpkg.org






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