[Users] OpenVZ on EL6 - weird network issue

Michael Stauber mstauber at blueonyx.it
Sat Dec 27 13:21:53 PST 2014

Hi Scott,

> [...] almost always it was inside of a commercial datacenter. 

Yeah, it's in a large datacenter as well.

> The cause of the problem seemed to be some upstream routing
> device that was periodically dropping ARP table entries for
> the containers.

That is indeed interesting. Well, I guess there is only one way to find
out. I'll set up a cronjob as suggested to do periodic arpseeds. It sure
won't hurt.

So far we tried this here:



echo 2 > /proc/sys/net/ipv4/conf/br0/rp_filter

That sounded good on paper, but just 20 hours later we had the next outage.

The OpenVZ wiki also pointed out this here ("Bridge doesn't forward


Yet I'm not sure how applicable that might be to us. I noted down the
current status of /proc/sys/net/bridge/* and will compare it with what
it'll be during the next loss of connectivity.

> I'd like to hear more once you get it figured out.

Sure, I'll post follow ups then. Likewise: If you have any other ideas
or suggestions, then I'd love to hear them.

With best regards

Michael Stauber

More information about the Users mailing list