I just received a message from sixxs telling my tunnel cannot be pinged. On my side, all seem ok. Online ping6 utility at SubnetOnline.com gives me : IPv6 Ping Output: PING 2a01:240:fe00:1a3::2(2a01:240:fe00:1a3::2) 32 data bytes 40 bytes from 2a01:240:fe00:1a3::2: icmp_seq=0 ttl=56 time=77.2 ms 40 bytes from 2a01:240:fe00:1a3::2: icmp_seq=1 ttl=56 time=76.7 ms 40 bytes from 2a01:240:fe00:1a3::2: icmp_seq=2 ttl=56 time=76.9 ms 40 bytes from 2a01:240:fe00:1a3::2: icmp_seq=3 ttl=56 time=77.6 ms --- 2a01:240:fe00:1a3::2 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3013ms rtt min/avg/max/mdev = 76.761/77.155/77.669/0.477 ms, pipe 2 So ping seems ok... Aiccu test all pass. So... is there anything else I have to do ?? Can there be any sort of timeout bringing the tunnel down when not used ? Redhat howto suggests so : Why that ? Should I really setup a cron job to ping6 somewhere on a regular basis ?? Thanks for your help.