[outages] fonts.gstatic.com IPv6 issues...

[Charles Sprickman]

On Nov 8, 2014, at 2:26 PM, Mark Kamichoff via Outages <outages at outages.org> wrote:

> On Sat, Nov 08, 2014 at 08:07:56AM -0500, Stephen Frost via Outages wrote:
>> I've been having issues w/ google IPv6 (more-or-less all services
>> operating over 80/443 have been really bad, though imap/993 has had
>> issues also) for at least 18 hours from a SixXS tunnel which terminates
>> in Ashburn.
> 
> "me too" (I'm in Seattle, USA)

Me three. 

> 
> I've narrowed down this issue to Google ignoring ICMPv6 PTBs.

Thanks for looking into this, it started affecting me (HE tunnel out
of NYC) yesterday, but I didnt have time to nail down what was going
on - just disabled v6 on the box I was working on so I could
continue to use Google search. 

Charles

>  It
> sometimes works sporadically for me, though.  Here's an example w/some
> tcpdumps:
> 
> http://www.prolixium.com/share/txt/google-ipv6-pmtud-fail.txt
> 
> Relevant lines are the following:
> 
> 13:51:34.046171 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6,
> packet too big, mtu 1280, length 1240
> 13:51:34.562579 IP6 2607:f8b0:4005:802::1006.443 >
> 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], seq 1:1429, ack
> 279, win 232, options [nop,nop,TS val 3392471676 ecr 756572814], length
> 1428
> 
> Google never lowers the packet length and so the connection times out.
> As others have mentioned, this only really affects tunneled users.
> 
> I've seen other organizations break this over the years but I never
> thought Google would make the list.. 
> 
> - Mark
> 
> -- 
> Mark Kamichoff
> prox at prolixium.com
> http://www.prolixium.com/
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