Re: New Version Notification for draft-hinden-ipv4flag-00.txt

Lorenzo Colitti <lorenzo@google.com> Mon, 20 November 2017 02:45 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Mon, 20 Nov 2017 11:44:51 +0900
Message-ID: <CAKD1Yr0H3c4okUARm7CC7nDREsubriVHTUediecqyOZnq3Uoag@mail.gmail.com>
Subject: Re: New Version Notification for draft-hinden-ipv4flag-00.txt
To: Fernando Gont <fgont@si6networks.com>
Cc: james woodyatt <jhw@google.com>, IPv6 List <ipv6@ietf.org>, Bob Hinden <bob.hinden@gmail.com>, Fernando Gont <fernando@gont.com.ar>
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On Sat, Nov 18, 2017 at 9:14 PM, Fernando Gont <fgont@si6networks.com>;
wrote:

> > Yep, a single flag won't work unless all routers agree on it. What about
> > an option that signified there was no IPv4 on the network? If the option
> > is sent by any of the routers on the link, then hosts would not attempt
> > IPv4 configuration.
>
> What would be the difference between encoding the info in an option vs
> in a flag?
>

A flag only has two values, 0 or 1. A boolean option can have three values:
not present, 0 or 1. The same can be achieved through two flags, of course.