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Re: [v6ops] Thoughts about wider operational input

Scott Morizot <tmorizot@gmail.com> Wed, 23 March 2022 09:45 UTC

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From: Scott Morizot <tmorizot@gmail.com>
Date: Wed, 23 Mar 2022 04:45:32 -0500
Message-ID: <CAFy81r=ALnKDMjmQryNnbZ38Rg726f10QgG8kMibvk3Y2Eh8Qg@mail.gmail.com>
To: Vasilenko Eduard <vasilenko.eduard=40huawei.com@dmarc.ietf.org>
Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>, "buraglio@es.net" <buraglio@es.net>, Ted Lemon <mellon@fugue.com>, "v6ops@ietf.org" <v6ops@ietf.org>
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Subject: Re: [v6ops] Thoughts about wider operational input
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On Wed, Mar 23, 2022 at 3:39 AM Vasilenko Eduard <vasilenko.eduard=
40huawei.com@dmarc.ietf.org> wrote:

> Nick, are you sure that IPv4 prioritization over IPv6 ULS is really the
> case for real OSes?
> If yes, IMHO: it is the bug in implementation (non-compliance to RFC 6724).
>
>
Here's the default prefix policy table in Windows. I believe that counts as
a real OS. And that is what RFC 6724 says to do. And altering it changes
things at the system level like the order of entries in the linked list
returned by GetAddrInfoW().

C:\bin>netsh interface ipv6 show prefixpolicies
Querying active state...

Precedence  Label  Prefix
----------  -----  --------------------------------
        50      0  ::1/128
        40      1  ::/0
        35      4  ::ffff:0:0/96
        30      2  2002::/16
         5      5  2001::/32
         3     13  fc00::/7
         1     11  fec0::/10
         1     12  3ffe::/16
         1      3  ::/96

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