In my Fritzbox it states the following: IPv6-Adresse: 2a02:8070:600::14b6:c7******, Gültigkeit: 100465/86065s IPv6-Präfix: 2a02:8070:62c:3200::/56, Gültigkeit: 100464/86064s I am not able to connect to IPv6 Addresses from computers configured by the fritzbox, because they get an address with prefix 2a02:8070:62c:3200::/56 but somehow the fritzbox does not route those addresses. Is this because the IPv6-Address is not in the prefix range? The address of the Fritzbox responds to pings, but my computers reached via various addresses from the prefix range do not (: PING 2a02:8070:62c:3200:28d****(2a02:8070:62c:3200:28d****) 32 data bytes From 2a02:8070:600:0:14b6*** icmp_seq=0 Destination unreachable: Administratively prohibited From 2a02:8070:600:0:14b6*** icmp_seq=1 Destination unreachable: Administratively prohibited From 2a02:8070:600:0:14b6*** icmp_seq=2 Destination unreachable: Administratively prohibited From 2a02:8070:600:0:14b6*** icmp_seq=3 Destination unreachable: Administratively prohibited blocked ping this is "view" from outside From inside the ping6 looks like this: traceroute -6 heise.de traceroute to heise.de (2a02:2e0:3fe:100::8), 30 hops max, 80 byte packets 1 fritz.box (2a02:8070:62c:3200:****) 0.787 ms 1.424 ms 1.702 ms 2 * * * ...... 30 * * *