I have read and followed the "Reporting Problems" section on the Contact page and am providing the following details for this report based on the list of items stated there: For some days (I'm not sure how long it's been :-(, my Subnet isn't reachable from the Internet. Subnet in question: R1395 (2001:6f8:123d::/48) Used tunnel: T2176 (2001:6f8:900:fd::2 as endpoint on my side) My Handle: JH27-6BONE (Jörg Hoh) Symptoms: * I can ping6 some machines on the ipv6-internet from the machine A which acts as tunnel endpoint on my side * I can ping6 machine A from my workstation and can also ping the IP6 of the tunnel endpoint 2001:6f8:900:fd::2 on machine A. * I cannot ping6 the tunnel endpoint on your side (2001:6f8:900:fd::1) from my workstation. tcpdump on the machine A shows the outgoing requests, but no reply. * Friends report that pinging(6) my workstation from their ipv6-enabled hosts reports "no route to host". Pinging my tunnelendpoint 2001:6f8:900:fd::2 shows no routing problem. I've added the address 2001:6f8:123d:0:20f:eaff:fe2f:a059 to machine A which is running24/7; you can use it for testing purpose, I don't block ping6 on my side. * Subnet R1395 is marked as "enabled" in the webfrontend of noc.sixxs.net/home This brings me to the conclusion that the routing on your side is broken. Thank you for fixing :-)