I am running OpenSuse 12.2, and have been running it and previous OpenSuse versions for some time without issue.
Linux c8a 3.4.33-2.24-xen #1 SMP Tue Feb 26 03:34:33 UTC 2013 (5f00a32) x86_64 x86_64 x86_64 GNU/Linux
Starting a few weeks ago, I am seeing behavior in which IPV6 connectivity suddenly dies. This typically happens after
about 2 days of uptime. IPV4 is unaffected. When IPV6 dies, all attempts to connect out to any IPV6 addresses result
in “network unreachable”. The default gateway is still in place, but the ipv6 routing table appears to be filled with individual
routes to various hosts. Once IPV6 fails, I am unable to delete routes, or add routes, or modify the routing table in any way.
I get the following message:
SIOCADDRT: Cannot allocate memory
The problem that I am having, now, appears to be identical to a similar problem reported ten years ago here:
However, I am not running 10-year-old linux, I’m running OpenSuse 12.2 with all updates applied.
Like the previous report, if I increase /proc/sys/net/ipv6/route/max_size above its default of 4096, my IPV6
connectivity is immediately restored. I can delete the bogus routes, and operate again. However, that’s only
a short fix - within hours the IPV6 network drops off again, and I am back to “network unreachable.”
Trying to restart networking, e.g. /etc/init.d/network stop; start, does not resolve the problem or restore
connectivity. Only a full reboot of the (virtual) server restores connectivity. (This is a Xen guest machine
running solo on an identically-configured Xen physical host. The guest handles all of the work and internet
traffic. The problem seems only to be on the guest machine, the physical host is unaffected.) I will also
mention that I have other identically-configured hot-standby backup host/guest pairs… they are also
unaffected but they do not handle any operational traffic. The problem seems limited to a high-traffic,
I have spent literally days looking for answers to this problem, and indeed for any other posts related to
this problem. I cannot believe that I’m experiencing a ghost problem from 10 years ago, and yet my symptoms
Could anyone familiar with IPV6 or routing please point me in the direction of a solution?
Thank you in advance!