[TriLUG] IPv6 tunnel problems

[Brian via TriLUG]

Hi Gang,

For a long time, I had a working setup with a Hurricane Electric IPv6 
tunnel.  Lately I've noticed that my IPv6 connectivity seems to be broken.

I went and created a new tunnel at he.net and seem to be able to 
establish the tunnel without a problem, but traffic doesn't seem to want 
to move.

My tunnel ifconfig:
he-ipv6: flags=209<UP,POINTOPOINT,RUNNING,NOARP>  mtu 1480
         inet6 2001:470:7:682::2  prefixlen 64  scopeid 0x0<global>
         inet6 fe80::ae6d:4332  prefixlen 128  scopeid 0x20<link>
         sit  txqueuelen 0  (IPv6-in-IPv4)
         RX packets 0  bytes 0 (0.0 B)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 0  bytes 0 (0.0 B)
         TX errors 22  dropped 0 overruns 0  carrier 22  collisions 0

I notice that all the packets are TX errors.  I'm not sure how to 
troubleshoot that.

ping6 ipv6.google.com just has 100% packet loss.

I'm still running iptables for firewalling, and have no outbound rules, 
and the default is accept.

What do I need to check?  I still know so little about IPv6...

Thanks,
-Brian