I've a static tunnel setup on a VPS server. It was working fine until last reboot and for some reason it is not working anymore. I reviewed the settings three times and can't tell what's wrong, so I'm asking for help. :) There is some hopefully useful info: /etc/network/interfaces: (...) auto sixxs iface sixxs inet6 v4tunnel address 2001:4978:f:50f::2 netmask 64 endpoint 216.14.98.22 ttl 64 up ip link set mtu 1280 dev sixxs up ip route add default via 2001:4978:f:50f::1 dev sixxs ping6 2001:4978:f:50f::1 PING 2001:4978:f:50f::1(2001:4978:f:50f::1) 56 data bytes ^C --- 2001:4978:f:50f::1 ping statistics --- 17 packets transmitted, 0 received, 100% packet loss, time 16013ms # ip link list 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 link/ether 00:16:3e:8d:b9:b6 brd ff:ff:ff:ff:ff:ff 3: sit0: <NOARP> mtu 1480 qdisc noop state DOWN link/sit 0.0.0.0 brd 0.0.0.0 6: sixxs@NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1280 qdisc noqueue state UNKNOWN link/sit 0.0.0.0 peer 216.14.98.22 # ip -6 route list 2001:4978:f:50f::/64 via :: dev sixxs metric 256 mtu 1280 advmss 1220 hoplimit 4294967295 fe80::/64 dev eth0 metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 via :: dev sixxs metric 256 mtu 1280 advmss 1220 hoplimit 4294967295 default via 2001:4978:f:50f::1 dev sixxs metric 1024 mtu 1280 advmss 1220 hoplimit 4294967295 And finally ifconfig sixxs: sixxs Link encap:IPv6 sobre IPv4 endereo inet6: 2001:4978:f:50f::2/64 Escopo:Global endereo inet6: fe80::6008:7095/64 Escopo:Link endereo inet6: fe80::6008:7099/64 Escopo:Link UP POINTOPOINT RUNNING NOARP MTU:1280 Mtrica:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:70 errors:0 dropped:0 overruns:0 carrier:0 colises:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:8097 (7.9 KiB)