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Re: Confirmation to advance: draft-ietf-6man-ipv6only-flag-05

Lorenzo Colitti <lorenzo@google.com> Wed, 08 May 2019 13:37 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 08 May 2019 22:36:56 +0900
Message-ID: <CAKD1Yr2=w4t_gEUHdDeQ5BXLywLEap8gM+yE+YAcnY8iuiawEg@mail.gmail.com>
Subject: Re: Confirmation to advance: draft-ietf-6man-ipv6only-flag-05
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: Nick Hilliard <nick@foobar.org>, IPv6 List <ipv6@ietf.org>, Bob Hinden <bob.hinden@gmail.com>
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>
> Anyhow, my take from speaking to a few host stack implementors it seems to
> me they'll take this flag as a hint initially and as the future slowly
> progresses it'll become more and more "authoritative" if it seems to work
> well.
>

Right. And as IPv4 becomes less important.


> The host stack vendors don't trust what the network tells them anyway, not
> without verifying. So at attachment they'll run connectivity checkers
> (does this give me Internet access? Captive Portal?) so they'll just plug
> the state of this flag into that machinery and check and verify, and would
> probably use the flag to do more exponential backoff on trying IPv4.
>

Right. There are too many misconfigured networks out there for hosts to
blindly do what the network tells them to do.

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