I think what's going on is that packets from www.ietf.org don't make it
back to my ISP. A ping6 or traceroute6 doesn't show any ICMP errors and
TCP sessions don't connect so it's not a PMTUD problem. So it's an
actual timeout.
I also just started noticing this, that is, that it does not work. And
there is a very simple explanation for this: 6bone space.
We (OCCAID) had recently turned up peering with a few networks (including HE
and others) and as a result our outbound path to HEAnet and other networks
had changed.
Some of the abrupt route changes are being corrected today evening and
hopefully should resolve pMTU problems in reaching www.ietf.org. If you
continue to experience trouble in reaching thru OCCAID via IPv6, please
don't hesitate to drop me a line in private.
Regards,
James
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