IPv6 subnet routing

[Martin]

I have 2 nodes nodeA and nodeB
I'm using tinc 1.1pre11

-- nodeA(fd80:2015:2105:abcd::1) :

$ ip -6 route
fd80:2015:2105:abcd::1 dev tun0  proto kernel  metric 256
fd80:2015:2105:adcd::/64 dev tun0  metric 1024
fe80::/64 dev eth0  proto kernel  metric 256

$ ping6 fd80:2015:2105:abcd::1
PING fd80:2015:2105:abcd::1(fd80:2015:2105:abcd::1) 56 data bytes
64 bytes from fd80:2015:2105:abcd::1: icmp_seq=1 ttl=64 time=0.020 ms

$ ping6 fd80:2015:2105:abcd::2
connect: Network is unreachable

-- nodeB(fd80:2015:2105:abcd::2):

$ ip -6 route
fd80:2015:2105:abcd::2 dev tun0  proto kernel  metric 256
fd80:2015:2105:adcd::/64 dev tun0  metric 1024
fe80::/64 dev eth0  proto kernel  metric 25

$ ping6 fd80:2015:2105:abcd::2
PING fd80:2015:2105:abcd::2(fd80:2015:2105:abcd::2) 56 data bytes
64 bytes from fd80:2015:2105:abcd::2: icmp_seq=1 ttl=64 time=0.019 ms

$ ping6 fd80:2015:2105:abcd::1
connect: Network is unreachable


I can see in the debug output that the tinc daemons on each node is talking
to each other.
I suspect kernel having some internal settings as I don't see any debug
message when I do a ping6 to the other node.
If I change the ip -6 route on both nodes to /48 it works fine.

On Thu, 21 May 2015 at 16:19 Guus Sliepen <guus at tinc-vpn.org> wrote:

> On Thu, May 21, 2015 at 02:26:54PM +0000, Martin wrote:
>
> > I've been trying out IPv6 networking with tinc and noticed that it will
> not
> > route smaller segments than /48
> > If I try to run ip -6 route add aaaa:bbbb:cccc:dddd::/64 dev tun0 I get
> > network unreachable
> > However if I run ip -6 route add aaaa:bbbb:cccc::/48 dev tun0 it works
> fine
> >
> > Is this is a limitation in tinc or the kernel network stack itself?
>
> You should be able to add any route with any prefix just fine. But can
> you show us the output of "ip -6 route show" and the exact command that
> you tried that fails?
>
> --
> Met vriendelijke groet / with kind regards,
>      Guus Sliepen <guus at tinc-vpn.org>
> _______________________________________________
> tinc mailing list
> tinc at tinc-vpn.org
> http://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tinc-vpn.org/pipermail/tinc/attachments/20150521/e975b9a5/attachment.html>