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

[Aaron C. de Bruyn]

Nice work Mark!

It only started for me about a week ago.  I've had my HE tunnel for years.
I wonder if they just enabled IPv6 service to that particular web property,
or if they made a recent config change.
Anyways, I wonder if someone from Google reads the outages list, or if
NANOG should be CC'd to get their attention.

On Sat, Nov 8, 2014 at 11:26 AM, 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)
>
> I've narrowed down this issue to Google ignoring ICMPv6 PTBs.  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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