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Re: IPv6 routing issue



On Fri, Dec 28, 2007 at 11:24:22PM +0100, strawks wrote:
> Hi all,
> 
> I'm currently trying to set up an IPv6 network at home by using services
> provided by SixXS.
> 
> For the moment I'm trying to give IPv6 access to 2 PCs.
> The first which will act as a router create the tunnel with a SixXS POP,
> it's working fine. This machine (namely nadia.irken.org) has an IPv6
> access. To provide IPv6 access to my others PCs I have the subnet
> 2001:6f8:306::/48
> 
> nadia.irken.org has two addresses :
>      2001:6f8:202:202::2 -> my end of the tunnel with SixXS
>  and 2001:6f8:306::1
is 2001:6f8:306::1 attached to eth0 with netmask /48
> 
> My other PC, kaname.irken.org has address 2001:6f8:306::11
> 
> When I try to ping6 www.ipv6.org with kaname, it seems not to work :
> tcpdump on nadia shows that echo requests comes from eth0 (local
> network) and goes out through the sixxs interface. nadia then receives
> replies from www.ipv6.org but does not forward them to kaname, instead
> nadia sends back an icmp6 destination unreachable error to www.ipv6.org.

can you ping 2001:6f8:306::1 from 2001:6f8:306::11, then can you ping 
2001:6f8:202:202::2.

if not look at ip -6 r g 2001:6f8:202:202::2 see what is says

try the reverse ping 2001:6f8:306::11 from 2001:6f8:306::1.

Also have you turned on ipv6 forwarding ? sudo sysctl -a | grep ipv6

also maybe check ip6tables -nvL 

> 
> Now what is strange is if I ping6 nadia from kaname (or the opposite) at
> the same time kaname pings www.ipv6.org all is working fine!
> 
> If I stop the ping between nadia and kaname, kaname still continues to
> receive replies from www.ipv6.org for a few seconds and then it stops
> working.
> 
> I presume this has something to do with the neighbor
> solicitation/advertisement feature, but I don't know how to solve the
> problem.
> 
> Please let me know if you need additional informations.
> 
> Any help would be greatly appreciated.
> -- 
> strawks <strawks@yahoo.fr>


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