Uhm; I tried the "New linux setup", which worked for me. It's weird the debian howto failed. Anyway my tunnel is up and running and I'm happy *D greetings Ward

The ::1 reply is quite obvious, your routing is peeped, you might consider reading the thread about 2.4.1 which could be related, then again, from "http://hope.webware.be/ipv6.txt": Should be: up ip route add 2000::/3 via 2001:838:300:7c::1 dev sit1 Though 'default' instead of 2000::/3 should work too if you have a 2.4.20+ and no routing. kernel and /3 makes the 1 drop off anyways. Apparently you got a load of other trash in your routing tables like: 3ffe:80ee:55c::/64 etc those are not routable over the POP. You also have quite some IPv4 aliases on the interface so you should specify a local IPv4 address for the tunnel. Also you have 2 other default gateways (::/0) going over even more other tunnels So clean up the trash first, there simply is too much cruft. Also note that 'ip -6 ro sho' and 'netstat -rnA inet6' sometimes differ in output. clearly indicates that nothing has been routed over the tunnel at all.