i had same problem too. i have installed aiccu. it works fine for a few months, i get both ipv6 and ipv4 connection. but suddenly, on these last 3 days, i can't ping ipv6 sites. my tunnel is T120022. if i try to ping, i got these notification: mer@mer-1015PW:~$ ping6 google.com PING google.com(2404:6800:4001:c01::8b) 56 data bytes From vnhan01.sixxs.net icmp_seq=2 Destination unreachable: Address unreachable From vnhan01.sixxs.net icmp_seq=4 Destination unreachable: Address unreachable From vnhan01.sixxs.net icmp_seq=5 Destination unreachable: Address unreachable help me please. i have to make a presentation about my dual stack network thesis next week. greets merlie

I also had the same problem with this for about 3 days already. Pinging ipv6.google.com (or any other ipv6 addresses and hostnames) always return: Destination unreachable: Address unreachable And, syslog show: aiccu[2806]: Successfully retrieved tunnel information for T121838 aiccu[2806]: Couldnt set interface name to sixxs: Device or resource busy (16) aiccu[2806]: Tunnel Setup Failed When I found the this ticket, ticket#9594494, has been resolved, I was hoping that my issue would also be resolved :( (I just though so) I restarted the server and thought of being able to ping the ipv6 addresses already. Now, aiccu wouldn't start anymore. It's service status is: stop/waiting. aiccu.log showed (after seeing the stop/waiting status, I attempted to start it): ============================================================ 20131806 15:28:37 Command line: /usr/sbin/aiccu start 20131806 15:28:42 SixXs Automatic IPv6 Connectivity Client Utility started 20131906 16:34:35 Stopping Automatic IPv6 Connectivity Client Utility 20131906 16:34:35 Automatic IPv6 Connectivity Client Utility stopped 20131906 16:36:22 Starting Automatic IPv6 Connectivity Client Utility 20131906 16:36:23 Checking access to tic.sixxs.net: 20131906 16:36:25 OK 20131906 16:36:25 SixXs Automatic IPv6 Connectivity Client Utility started 20131906 16:37:28 Stopping Automatic IPv6 Connectivity Client Utility ============================================================ syslog shows: ============================================================ Couldn't connect to the TIC server tic.sixxs.net Couldn't retrieve first tunnel for the above reason, aborting. Also, I found several lines of these logs: radvd[2885] resetting IPv6-allrouters membership on eth0 radvd[2710] resetting IPv6-allrouters membership on eth0 . . radvd[2885] resetting IPv6-allrouters membership on eth0 radvd[2710] resetting IPv6-allrouters membership on eth0 . . ============================================================ If anyone could enlighten me, I would greatly appreciate it. :) Have I reached the aiccu stop/start limit and have been blocked from TIC? :( How long will I be blocked? By the way, my tunnel Id is: T121838 Thanks.