Linux IPv6 routing strange behaviour

Mikael Abrahamsson swmike at
Thu Aug 15 14:41:42 CEST 2013

On Thu, 15 Aug 2013, Jeroen Massar wrote:

> Yes, that is 5 /40s worth of address space and everything is piped into 
> the sixxs interface to a single neighbor that lives on the tapped 
> interface. We thus indeed hit the Linux routing logic a bit, but as the 
> table is small and it is a single neighbor nothing much dynamic happens 
> there. "ip -6 monitor route" is thus nice an silent.

So you're actually not seeing any flow based routing here?

"cat /proc/net/ipv6_route" contains just those routes you see in "ip -6 r 

Because in my linux kernel 3.2 based machines I have a lot more entries in 
"cat /proc/net/ipv6_route" than I have routes.

Mikael Abrahamsson    email: swmike at

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