[Xen-users] PV domU loses connectivity on xen 4

[Dmitry Nedospasov <dmitry@xxxxxxxxx>]

Hey Everyone,

I'm running a Debian Squeeze system with the following:
xen 4.0.1 (xen-hypervisor-4.0-amd64 4.0.1-1)
linux 2.6.32-5-xen-amd64 (linux-image-2.6.32-5-xen-amd64 2.6.32-23)

Networking is being handled by the default network-bridge script.

So the problem I'm having is that the domU loses connectivity abruptly.
I've done tcpdumps on the domU interface, the dom0 interface and on a
computer on the same network. After the connectivity drops on the domU
all i see are arp packets.

What i specifically see is:

11:40:51.149221 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 
192.168.0.140 tell 192.168.0.190, length 46
11:40:52.095454 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 
192.168.0.190 tell 192.168.0.140, length 28
11:40:52.095524 ARP, Ethernet (len 6), IPv4 (len 4), Reply 192.168.0.190 is-at 
00:11:25:c4:39:31, length 46
11:40:53.095454 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 
192.168.0.190 tell 192.168.0.140, length 28
11:40:53.095526 ARP, Ethernet (len 6), IPv4 (len 4), Reply 192.168.0.190 is-at 
00:11:25:c4:39:31, length 46
11:40:54.095456 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 
192.168.0.190 tell 192.168.0.140, length 28
11:40:54.095528 ARP, Ethernet (len 6), IPv4 (len 4), Reply 192.168.0.190 is-at 
00:11:25:c4:39:31, length 46

So basically the domU (.140) is constantly asking for the gateway's
(.190) mac, the gateway replies, and also asks for the domU's mac, but
never gets a response.

Anyway clearly the gateway arp packets aren't reaching the domU, other
computers on the same network (including the dom0) also have no
connectivity to the domU.

Any ideas? I would love to debug this issue... I just don't know what I
can do next.

D.
-- 
Dmitry Nedospasov <dmitry@xxxxxxxxx> -- Twitter: @nedos
Web: http://nedos.net -- Github: http://github.com/nedos

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