On 07/25/2012 01:13 PM, Ian Campbell wrote:
On Tue, 2012-07-17 at 19:05 +0200, Hans van Kranenburg wrote:
On 07/10/2012 08:16 PM, Ian Campbell wrote:
On Fri, 2012-06-29 at 16:06 +0200, Hans van Kranenburg wrote:
We're seeing weird behaviour regarding network traffic between a Xen
dom0 and domU. I reported this issue yesterday to the
openvswitch-discuss mailing list, but it seems this could also be a
(regression?) bug in the xen hypervisor or the linux kernel...
Did you get any response from the vswitch folks?
The response from Ben Pfaff (nicira/openvswitch) was like: "I wish I had
something to suggest, but this seems like a truly bizarre problem."
That's basically what I was thinking too.
I really hate the fact I haven't been able to reproduce the situation
again...
I've had a trawl through the upstream netback fixes and although there
are one or two which sound like they might be relevant none of them are
actually relevant to the version of netback in Squeeze. Likewise for the
netfront driver.
Is the traffic all on-box or is it off box (and does it make a
difference?). There might be some similarities with
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=631102
No difference.
The line "It's possible to "revive" the DomU for a short while by
getting a console with xm on Dom0 and then sending pings to the Dom0 and
other hosts." from 631102 very much looks like my report, and that's why
I first thought it could be an arp/mac-address issue, but while seeing
the arp requests not being answered but being present on the dom0-part
of the virtual interface I got confused. Anyway, repeating myself now.
Aditionally, it might be worth noting that the issue didn't affect all
virtual network interfaces in the domU. I could login over a different
interface just fine and from there generate traffic to the outside of
the domU.
[...]
...the first thing to do would be to reproduce this using the exact
software/hardware situation it originated in, and that seems to be quite
a challenge already...
Right, I'm not sure what else can be done I'm afraid, I'm rather
perplexed :-/
I'll try again, using a test-system that can be left in a broken state
for research if I manage to break it.
--
Hans van Kranenburg - System / Network Engineer
+31 (0)10 2760434 | [email protected] | www.mendix.com
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