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Re: [v6ops] ULA precedence [Thoughts about wider operational input]

Lorenzo Colitti <lorenzo@google.com> Mon, 25 April 2022 00:39 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Mon, 25 Apr 2022 09:39:02 +0900
Message-ID: <CAKD1Yr1WJi-2kg-BEcCWHcEQGfMdMigsRt_15ZmeMkA27eqZKw@mail.gmail.com>
To: Nicholas Buraglio <buraglio@es.net>
Cc: Erik Auerswald <auerswald@fg-networking.de>, Ted Lemon <elemon@apple.com>, v6ops list <v6ops@ietf.org>, 6man list <ipv6@ietf.org>
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Subject: Re: [v6ops] ULA precedence [Thoughts about wider operational input]
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On Mon, Apr 25, 2022 at 9:29 AM Nick Buraglio <buraglio@es.net> wrote:

> Additionally, maybe we could clarify that the longest-prefix match rule
>> does not apply to ULAs outside the same /48? I think that would fix the
>> issue observed by +Ted Lemon <elemon@apple.com> in home networks:
>> https://datatracker.ietf.org/meeting/113/materials/slides-113-6man-source-address-selection-for-foreign-ulas-00
>> .
>>
>
> I also have data that supports the longest match not applying to ULA.
>

Looks like at least one popular implementation does apply it:

https://cs.android.com/android/platform/superproject/+/master:packages/modules/DnsResolver/getaddrinfo.cpp

AFAICT the code assigns ULA a label of 13 and a precedence of 3 as per RFC
6724 section 2.1, and applies the common prefix length rule to all IPv6
addresses including ULA.

>

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