My local LAN has connectivity using tunnelborker. Works fine most of the time, but I'm having problems with some clients accessing Google servers. I've narrowed it down to what looks to be a large packet problem between HE and google. Here's a MTR with small (default) packets:
My traceroute [v0.75]
orcas (::) Fri Jun 17 22:40:45 2011
Keys: Help Display mode Restart statistics Order of fields quit
Packets Pings
Host Loss% Snt Last Avg Best Wrst StDev
1. 2001:470:1f05:de3::2 0.0% 133 0.3 0.3 0.2 0.5 0.0
2. thardie-1.tunnel.tserv3.fmt2.ipv6.he.net 0.0% 133 32.8 31.2 25.4 53.2 5.4
3. gige-g5-19.core1.fmt2.he.net 0.0% 133 21.5 27.4 15.6 66.6 10.3
4. 10gigabitethernet1-2.core1.pao1.he.net 0.0% 133 22.7 24.8 16.7 51.5 6.3
5. core2-1-1-0.pao.net.google.com 0.0% 133 18.2 26.1 16.4 82.5 12.2
6. 2001:4860::1:0:21 0.0% 132 35.2 26.2 18.1 80.8 9.5
7. 2001:4860:0:1::1b7 0.0% 132 18.8 24.9 17.8 178.9 15.4
8. 2001:4860:4001:803::1011 0.0% 132 19.9 24.7 17.6 64.0 7.4
When the problem is happening, if I do a MTR with large packets (1000 bytes) between hops 4 and 5, loss will go up dramatically (around 20-30%), and it follows to all the hops below.
It doesn't happen all the time. Seems there's some congestion on that link?
Thanks,
Terry
Can you please send a traceroute showing the loss with the larger MTU and any further information you might have? If it's only happening with larger packets, it sounds more like a PMTU issue and I can see if there's something I can track down with Google.