Hi, * my tunnel (T54825) stopped working after over a week. * NIC-Handle: MSN16-SIXXS aiccu test Results: * everthing works until its pinging the inner-tunnel remote endpoint: PING 2001:6f8:1c00:3a7::1(2001:6f8:1c00:3a7::1) 56 data bytes --- 2001:6f8:1c00:3a7::1 ping statistics --- 3 packets transmitted, 0 received, 100% packet loss, time 2017ms More information: * tunnel is configured using aiccu on pc server (gentoo) in local network (private class-c net) * behind NAT-Router (linux as well, small linksys box with tomato firmware (dnsmasq+iptables)) Info from that gentoo box: lisa ~ # ip a 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 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: sit0: <NOARP> mtu 1480 qdisc noop state DOWN link/sit 0.0.0.0 brd 0.0.0.0 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:24:8c:5d:61:6c brd ff:ff:ff:ff:ff:ff inet 192.168.1.1/24 brd 192.168.1.255 scope global eth0 inet6 2001:6f8:1ddc::1/64 scope global valid_lft forever preferred_lft forever inet6 fe80::224:8cff:fe5d:616c/64 scope link valid_lft forever preferred_lft forever 19: sixxs: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1280 qdisc pfifo_fast state UNKNOWN qlen 500 link/none inet6 2001:6f8:1c00:3a7::2/64 scope global valid_lft forever preferred_lft forever inet6 fe80::4f8:1c00:3a7:2/64 scope link valid_lft forever preferred_lft forever lisa ~ # ip r 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.1 metric 3 127.0.0.0/8 via 127.0.0.1 dev lo default via 192.168.1.254 dev eth0 metric 3 lisa ~ # ip -6 r 2001:6f8:1c00:3a7::/64 dev sixxs proto kernel metric 256 mtu 1280 advmss 1220 hoplimit 0 2001:6f8:1ddc::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0 fe80::/64 dev sixxs proto kernel metric 256 mtu 1280 advmss 1220 hoplimit 0 default via 2001:6f8:1c00:3a7::1 dev sixxs metric 1024 mtu 1280 advmss 1220 hoplimit 0 iptables is stopped to make sure its not the firewall: lisa ~ # iptables -vnL Chain INPUT (policy ACCEPT 1226 packets, 184K bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 1165 packets, 486K bytes) pkts bytes target prot opt in out source destination lisa ~ # ip6tables -vnL Chain INPUT (policy ACCEPT 12 packets, 1248 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 18 packets, 1776 bytes) pkts bytes target prot opt in out source destination lisa ~ # lisa ~ # ntpq -pn remote refid st t when poll reach delay offset jitter ============================================================================== +213.9.73.106 134.34.3.18 2 u 155 1024 377 24.273 1.117 0.228 +85.25.139.186 130.149.17.8 2 u 248 1024 377 28.643 1.267 0.343 -85.31.187.67 131.188.3.222 2 u 730 1024 377 28.283 -2.983 19.730 *46.4.54.78 129.69.1.153 2 u 58 1024 377 28.887 -0.041 0.055 lisa ~ # I restarted the router too(to have "clean" internet connection, regarding state tables etc) The setup here did not change i any way since a week. TIA -Marc