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Re: [v6ops] Happy eyeballs suggestions, was: Re: Apple and IPv6, a few clarifications

Iljitsch van Beijnum <iljitsch@muada.com> Tue, 23 June 2015 00:11 UTC

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From: Iljitsch van Beijnum <iljitsch@muada.com>
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Date: Tue, 23 Jun 2015 02:11:15 +0200
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To: Owen DeLong <owen@delong.com>
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Subject: Re: [v6ops] Happy eyeballs suggestions, was: Re: Apple and IPv6, a few clarifications
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On 23 Jun 2015, at 2:03, Owen DeLong <owen@delong.com> wrote:

> Thus, you’ve got a scenario where NAT64 testing is inadequate vs. NAT64 + Native V6 testing which was, in fact, the original question.

Like I said, if you want to test for paths that don't support 1500 byte path MTUs, please test with paths that don't support 1500 byte path MTUs rather than make assumptions based on the presence or absence of a packet size reducing apparatus.

But IPv6 UDP applications shouldn't concern themselves with testing for PMTUD black holes. This breaks TCP anyway, giving the user much bigger fish to fry. And IPv4 UDP applications should leave the DF bit alone because setting it to one can only end in tears.

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