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Re: [v6ops] draft-pauly-v6ops-happy-eyeballs-update-01

Ca By <cb.list6@gmail.com> Thu, 30 March 2017 12:41 UTC

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From: Ca By <cb.list6@gmail.com>
Date: Thu, 30 Mar 2017 12:41:05 +0000
Message-ID: <CAD6AjGQh+yoigRaUNTK28k2P5u87jC6M84V93g7+P3dBaZmqXw@mail.gmail.com>
To: Mikael Abrahamsson <swmike@swm.pp.se>, Philip Homburg <pch-v6ops-7@u-1.phicoh.com>
Cc: v6ops@ietf.org
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Subject: Re: [v6ops] draft-pauly-v6ops-happy-eyeballs-update-01
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On Thu, Mar 30, 2017 at 5:21 AM Mikael Abrahamsson <swmike@swm.pp.se> wrote:

> On Thu, 30 Mar 2017, Philip Homburg wrote:
>
> > A host would have to probe every time it connects to a network for local
> > PMTU limitations. I wonder what the operational impact would be if every
> > host would start sending maximum sized packets to some well known
> > destination right after connecting to the network.
>
> Well, I advocate to send lower MTU than 1500 in RA if you know that the
> upstream has lower than 1500 MTU. Otherwise you get a lot of useless PMTUD
> traffic from clients. Doing bidirectional MSS clamping makes sense as
> well, and I think some residential routers do this already.
>

Many, if not most, mobile providers do mss clamping.



> --
> Mikael Abrahamsson    email: swmike@swm.pp.se
>
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