Re: problem configuring squeeze

On Sun, May 15, 2011 at 04:36:29PM +0200, Pascal Hambourg wrote:
> Hello,
> 
> Eugen Leitl a écrit :
> > I've got a /56 from which I assigned to eth0 a 
> > 2a01:4f8:7d:300::2, with the gateway 2a01:4f8:7d:300::1
> > 
> > I can ping the assigned address from outside (another 
> > machine with a sixx tunnel), but no dice with e.g.
> > ping6 ipv6.google.com
> > PING ipv6.google.com(2a00:1450:8005::68) 56 data bytes
> > 
> > It looks like a route problem. My routes look like
> > 
> > route --inet6
> 
> The output of ip -6 addr and ip -6 route may be more compact.

You were correct, IPv6 autoconfiguration was the culprit.
It is very annoying to switch off, I had to use the 
recipe from https://tools.bitfolk.com/wiki/IPv6

What worked for me (from /etc/network/interfaces ):

# WAN IPv6 from 2a01:4f8:7d:300::/56
iface eth0 inet6 static
address 2a01:4f8:7d:300::2
gateway 2a01:4f8:7d:300::1
netmask 64
# Disable autoconf
post-up echo 0 > /proc/sys/net/ipv6/conf/default/accept_ra
post-up echo 0 > /proc/sys/net/ipv6/conf/all/accept_ra
post-up echo 0 > /proc/sys/net/ipv6/conf/$IFACE/accept_ra
post-up echo 0 > /proc/sys/net/ipv6/conf/default/autoconf
post-up echo 0 > /proc/sys/net/ipv6/conf/all/autoconf
post-up echo 0 > /proc/sys/net/ipv6/conf/$IFACE/autoconf

Thanks!
 
> > Kernel IPv6 routing table
> > Destination                    Next Hop                   Flag Met Ref Use If
> > 2a01:198:200::/64              ::                         UAe  256 0     3 eth0
> > 2a01:4f8:7d:300::/56           ::                         U    256 0     1 eth0
> 
> IMO the prefix length for any local prefix should always be /64. The
> purpose of a /56 prefix is to be divided into multiple /64 prefixes.
> 
> > ::/0                           2a01:4f8:7d:300::1         UG    1024 0    1 eth0
> > ::/0                           fe80::2e0:81ff:fe58:58b3   UGDAe 1024 0    0 eth0
> > 2a01:198:200:0:225:90ff:fe02:326e/128 ::                  Un    0    1    3 lo
> > 2a01:4f8:7d:300::2/128         ::                         Un    0   1     6 lo
> 
> It looks like eth0 has also got a prefix 2a01:198:200::/64 and default
> router from stateless autoconfiguration (a router on the link sends
> advertisements for this prefix). Maybe your box uses the wrong source
> prefix and router combination when sending packets. If you don't want
> eth0 to use stateless autoconfiguration, you can disable by setting
> /proc/sys/net/ipv6/conf/eth0/autoconf to 0.
> 
> 
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-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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