I noticed from work and home today that Google via IPv6 (http://ipv6.google.com/ or http://www.google.com/ with Google over IPv6) was horribly slow and most of the time unresponsive.  Turns out that Google may be chucking ICMPv6 type 2 messages (packet too big).  See here.

Yeah, so these messages are just a tad crucial to PMTUD and royally break tunnelled things when they're filtered.

Google, unblock this, pretty please!

(tried this from work w/HE.net tunnel and via a tunnel to my box at Voxel that has native IPv6, however, some other folks don't seem to be affected)

Update: So, I started a thread about it on the ipv6-ops list…

New comments are currently disabled for this entry.