[Users] Outbound networking failure

[Andrew Vagin]

On 03/14/2012 11:26 AM, Maoke wrote:
> yes but we still have other troubles with the 2.6.32-042stab044.11. :P 
> so we are trying to understand the problem first.
I don't suggest to move on 2.6.32 kernel. I said about 
2.6.18-028stabXXX.Y. You can find a last stable 2.6.18 kernel here: 
http://download.openvz.org/kernel/branches/rhel5-2.6.18/stable/

This issue may be already fixed.

> - maoke
>
> 2012/3/14 Andrew Vagin <avagin at parallels.com 
> <mailto:avagin at parallels.com>>
>
>     2.6.18-194.3.1.el5.028stab069.6xen is a very old version. Could
>     you update it?
>
>
>     On 03/14/2012 10:28 AM, Maoke wrote:
>
>         sorry if this is more of a Xen problem.
>
>         we are running openvz in Xen PVs (kernel
>         2.6.18-194.3.1.el5.028stab069.6xen), and occasionally the
>         network of a PV, as well as the PV's hosted containers, at a
>         virtual interface is lost. sometimes restarting the network
>         can solve the problem but in most cases we have to restart the
>         PV. the PVs another virtual interface was working and other
>         PVs and the HV keeps working.
>
>         detailed observation through tcpdump at the trouble time shows:
>         1. the inbound traffics can be delivered correctly through
>         eth0 of the PV until venet0;
>         2. it looks the venet0 is also correctly functioned because
>         TCP sync may get response from container and this sync ack can
>         be seen at venet0;
>         3. but at the eth0 of PV, we only have seen the TCP sync
>         request towards the containers while the sync ack is missing,
>         thus TCP state of the container's application remains SYNC_RECV
>         4. if ping the PV, at the eth0, we only have seen the ICMP
>         echo requests but the replies are missing.
>
>         we didn't encounter the same problem when those openvz stuffs
>         were running over physical machine instead of xen.
>
>         does anyone have any hints or ideas? thanks a lot in advance.
>
>         - maoke
>
>
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