Problem with ipv6 tunneling

[lpetrov]

Few days ago i'd setuped ipv6 tunnel that was working just perfect. Since today the tunneling is not working, for example:

root@reborn:~# tracepath6 2001:470:1f0a:XXX::1
1?: [LOCALHOST]                      pmtu 1480
1:  send failed
1:  send failed
     Resume: pmtu 1480

I've no access to the gateway, any ideas what is the problem or how can i debug it ?

[patrickdk]

send failed, means that linux can't get the packet to leave the computer.

Normally it happens due to a firewall on the machine, lack of configuring an ip, or missing routes.

[lpetrov]

argh... seems that somehow ufw (ubuntu firewall) was blocking IPv6.
now fixed, sorry bothering :)