[153240] in North American Network Operators' Group
IPv6 day and tunnels
daemon@ATHENA.MIT.EDU (Joe Maimon)
Sun Jun 3 21:39:39 2012
Date: Sun, 03 Jun 2012 21:38:58 -0400
From: Joe Maimon <jmaimon@ttec.com>
To: North American Networking and Offtopic Gripes List <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Well, IPv6 day isnt here yet, and my first casualty is the browser on
the wife's machine, firefox now configured to not query AAAA.
Now www.facebook.com loads again.
Looks like a tunnel mtu issue. I have not as of yet traced the
definitive culprit, who is (not) sending ICMP too big, who is (not)
receiving them, etc.
www.arin.net works and worked for years. www.facebook.com stopped June 1.
So IPv6 fixes the fragmentation and MTU issues of IPv4 by how exactly?
Or was the fix incorporating the breakage into the basic design?
In IPv4 I can make tunneling just work nearly all of the time. So I have
to munge a tcp mss header, or clear a df-bit, or fragment the
encapsulated packet when all else fails, but at least the tools are
there. And on the host, /proc/sys/net
In IPv6, it seems my options are a total throwback, with the best one
turning the sucker off. Nobody (on that station) needs it anyways.
Joe
