google path mtu?

[Matthew Luckie]

The path MTU is available to applications.  It seems like a bug in
QUIC or Chrome to not send smaller packets when it can know the packets
will be fragmented.  Or just use TCP.

On Fri, Jan 23, 2015 at 11:55:57AM +0900, Lorenzo Colitti wrote:
> Thanks for reporting this. What was the effect? Connections just getting stuck?
> Was there fallback to IPv4?
> 
> Personally I don't understand why everyone behind a manually-configured tunnel
> doesn't set the MTU in the RA to the MTU of the tunnel... but that's not an
> excuse for things not working.
> 
> On Fri, Jan 23, 2015 at 11:45 AM, Mikael Abrahamsson <swmike at swm.pp.se> wrote:
> 
> 
>     I had another problem with Youtube just now, with Chrome+OSX. I saw my
>     machine sending fragmented UDP-packets to google on 443, which it was not
>     getting any responses to. On a hunch, I disabled QUIC in Chrome which made
>     things start working again.
> 
>     03:20:45.891286 IP6 2001:470:X > 2a02:808:1:100::c: frag (0|1232) 59430 >
>     443: UDP, length 1350
>     03:20:45.891286 IP6 2001:470:X > 2a02:808:1:100::c: frag (1232|126)
> 
> 
>     --
>     Mikael Abrahamsson    email: swmike at swm.pp.se
> 
> 
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