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

Mikael Abrahamsson <swmike@swm.pp.se> Thu, 30 March 2017 12:21 UTC

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Date: Thu, 30 Mar 2017 14:20:57 +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:

> 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.

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

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