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

Mikael Abrahamsson <swmike@swm.pp.se> Thu, 30 March 2017 10:15 UTC

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Date: Thu, 30 Mar 2017 12:14:58 +0200
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Philip Homburg <pch-v6ops-7@u-1.phicoh.com>
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Subject: Re: [v6ops] draft-pauly-v6ops-happy-eyeballs-update-01
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On Thu, 30 Mar 2017, Philip Homburg wrote:

> It is hard to quantify, but in IPv4 lots of potential PMTU problems are 
> masked by MSS clamping.

Yes. I don't have data, but I have commonly talked to people in the 
business who are of the opinion that MSS clamping solves "all" problems.

When I point out that there are other protocols I typically get back that 
MSS clamping is good enough and solved all their customer complaints.

While I don't really like the approach, I think the pragmatic thing to do 
is to have the devices themselves have the ability to do PMTUD clamping if 
they have lots of problems that can be attributed to PMTUD, and then have 
this reported by means of diagnostics report to application/device vendor.

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

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