Linux IPv6 routing strange behaviour

Hannes Frederic Sowa hannes at
Thu Aug 15 15:15:15 CEST 2013

On Thu, Aug 15, 2013 at 04:06:11PM +0300, Max Tulyev wrote:
> On 15.08.13 15:14, Hannes Frederic Sowa wrote:
> > 
> > You can also monitor routing insertion/deletion with ip -6 monitor route.
> > 
> Yes! I think it shows the problem more. There are a lot of this errors:

I don't see timestamp but I guess you have a massive churn in the ip6_fib
because of the deletion and immediate insertion of prefixes.

> netlink receive error No buffer space available (105)

netlink are sockets, too, and they can run out of receive
buffer. Try ip -rc with a higher value then 1048576. Max value is
/proc/sys/net/core/rmem_max/rmem_max (you can increase this, too).

Thanks for the dumps, I will have a closer look later today.



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