I got a routing problem when using the surfnet POP, I cant reach from my teredo address "2001:0:53aa:64c:3871:3c7b:a7b1:924a" to my sixxs ipv6 "2001:610:600:66e::2". But I can reach them both from the shell server at XS4ALL. Here a traceroute from "2001:610:600:66e::2" (nl5ams) to my teredo address. This one failes. #traceroute6 2001:0:53aa:64c:3871:3c7b:a7b1:924a traceroute to 2001:0:53aa:64c:3871:3c7b:a7b1:924a (2001:0:53aa:64c:3871:3c7b:a7b1:924a) from 2001:610:600:66e::2, 30 hops max, 16 byte packets 1 gw-1647.ams-05.nl.sixxs.net (2001:610:600:66e::1) 1.722 ms 1.331 ms 1.134 ms 2 vl163.sw14.amsterdam1.surf.net (2001:610:1:80bb:192:87:102:97) 1.335 ms 1.331 ms 1.401 ms 3 2001:610:188:140:7268:7275:6c7a:4143 (2001:610:188:140:7268:7275:6c7a:4143) 1.589 ms 1.483 ms 1.468 ms 4 * * * 5 * * * 6 * * * ^C Here from "2001:610:600:66e::2" (nl5ams) to the shell server from xs4all. This one is ok. #traceroute6 xs6.xs4all.nl traceroute to xs6.xs4all.nl (2001:888:0:1::666) from 2001:610:600:66e::2, 30 hops max, 16 byte packets 1 gw-1647.ams-05.nl.sixxs.net (2001:610:600:66e::1) 1.639 ms 1.341 ms 1.332 ms 2 vl163.sw14.amsterdam1.surf.net (2001:610:1:80bb:192:87:102:97) 1.469 ms 1.259 ms 1.52 ms 3 2001:610:f01:9168::169 (2001:610:f01:9168::169) 1.581 ms 1.459 ms 1.556 ms 4 AE1.500.JNR02.Asd002A.surf.net (2001:610:e08:68::69) 1.766 ms 1.521 ms 1.607 ms 5 0.ge-0-2-0.xr1.sara.xs4all.net (2001:610:16:6056::58) 5.405 ms 2.193 ms 1.9 ms 6 0.so-2-0-0.xr4.1d12.xs4all.net (2001:888:0:1152::1) 9.374 ms 2.06 ms 2.036 ms 7 xs6.xs4all.nl (2001:888:0:1::666) 1.948 ms 2.047 ms 1.982 ms And here one from the shell server at xs4all to my teredo address. This one is also ok. #traceroute6 2001:0:53aa:64c:3871:3c7b:a7b1:924a traceroute6 to 2001:0:53aa:64c:3871:3c7b:a7b1:924a (2001:0:53aa:64c:3871:3c7b:a7b1:924a) from 2001:888:0:1::666, 30 hops max, 12 byte packets 1 124.ae0.xr4.1d12.xs4all.net 0.388 ms 0.312 ms 0.283 ms 2 0.ge-0-2-0.xr1.sara.xs4all.net 1.236 ms 29.506 ms 5.069 ms 3 ams-ix.ipv6.concepts.nl 0.767 ms 1.005 ms 0.956 ms 4 2001:838:5:a::2 2.650 ms 2.692 ms 2.614 ms 5 teredo-relay.concepts-ict.net 2.776 ms 2.524 ms 2.481 ms 6 2001:0:53aa:64c:3871:3c7b:a7b1:924a 27.294 ms 26.943 ms 26.182 ms So it seems the POP at surfnet doesn't know the route for my teredo address. Here are my tunnel details: My handle DK666-6BONE Tunnel Id : T25734 PoP Name : nlams05 (nl.surfnet [AS1103]) Your Location : Amsterdam, nl SixXS IPv6 : 2001:610:600:66e::1/64 Your IPv6 : 2001:610:600:66e::2/64 SixXS IPv4 : 192.87.102.107 Tunnel Type : Static (Proto-41) Your IPv4 : 213.19.146.50