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Re: Running code (Was: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt)

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 24 October 2018 02:54 UTC

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Subject: Re: Running code (Was: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt)
To: Fernando Gont <fgont@si6networks.com>, Lee Howard <lee@asgard.org>, ipv6@ietf.org
References: <CAFU7BASO_ByzbanhLKnWV280O_fASd-8W+ujpj3sN6d2-whw2w@mail.gmail.com> <CACWOCC-u7aAPwAOcixYvt2On=-o_8X25GhqdXTfA+tWRC1o2XA@mail.gmail.com> <3beca72e-19c5-10af-02e5-c21a90d77100@gmail.com> <20181019.223739.271916573.sthaug@nethelp.no> <4f58643c-272e-507e-3282-c87befd42395@gmail.com> <0927741c-4e8e-fcf7-ddd6-3ba500ba4c3d@si6networks.com> <7B48A11D-31DE-443C-B73A-14642EA0A397@jisc.ac.uk> <7526af75-4359-6fc6-e39b-eb94024a04de@si6networks.com> <E1BB1232-C1A2-496A-8157-0682D91EED42@steffann.nl> <5E75F3CA-F1D2-4F4F-9CF7-EEEE59634C1E@gmail.com> <C46C990E-0A4F-4731-8CB1-FD204858935E@consulintel.es> <9B53019C-3506-4C9E-AFCF-D6125FA1A65B@gmail.com> <1157b739-3a66-8d45-e3e1-e5f904dfb9bc@asgard.org> <a00607f9-7ced-f889-b5cb-c2fe16367d73@si6networks.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <66759b73-0a22-e1a9-49db-21154e8e1267@gmail.com>
Date: Wed, 24 Oct 2018 15:54:48 +1300
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On 2018-10-24 11:13, Fernando Gont wrote:

<snip>

> 
> In this particular case (ipv6-only flag), what goes on the wire is
> simple enough that..I don't think having an implementation will buy much
> wrt how different implementations interoperate with each other. And the
> insights you'll gain from an implementation are most likely "out of the
> scope of the I-D", since how you disable the IPv4 stack is certainly
> going to be very implementation-dependent. (me thinking out loud)
> 

Exactly right. There isn't actually an interop requirement of any kind.
This is a one-way signal from the routers to each host, and each host
may choose what to do with that information. Legacy hosts will ignore
it, for example. A host with a sophisticated connection manager might
use a complicated heuristic, and there are many possibilities in
between, which is the reason that the draft uses SHOULD language.

     Brian

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