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David Arendt wrote:

> I have configured my linux (kernel 2.6.0-test7) for 6to4 
> access (using 2002:... addresses). Iptables for ipv6 is 
> enabled but no rules are defined and default policy is 
> accept. Connection to the internet over this tun6to4 device 
> seems to work without any problems, but the person which who 
> I tested the connect by telnet over ipv6 get no connection. 

Start debugging:
- - Do traceroute6's to the other end.
- - tcpdump the connection to see icmp's etc.
- - check your routing table (2000::/3 or ::/0 in use?
- - interfaces
- - firewalls (though you mentioned that)

Problem with 6to4 is that you never know where your
traffic is flowing from/to especially as the backpath
can be really completely different as the forward path.

You can also try to telnet to port 80 of IPv6 enabled
webservers and issue HTTP commands by hand etc.

Have fun ;)

Greets,
 Jeroen


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