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Re: Alternatives to the flag (Was:Confirmation to advance: draft-ietf-6man-ipv6only-flag-05)

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 15 May 2019 20:44 UTC

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Subject: Re: Alternatives to the flag (Was:Confirmation to advance: draft-ietf-6man-ipv6only-flag-05)
To: Nick Hilliard <nick@foobar.org>, David Farmer <farmer@umn.edu>
Cc: 6man WG <ipv6@ietf.org>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Thu, 16 May 2019 08:44:42 +1200
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On 16-May-19 01:34, Nick Hilliard wrote:
> David Farmer wrote on 15/05/2019 14:27:
>> So, I'm not willing to drop what I think is a viable solution to the 
>> problem unless other stakeholders are willing to buy into this kind of 
>> change. In particular, I'm thinking the people maintaining mDNS in dnssd 
>> wg. I can't see making the change proposed above without their buy-in.
> [...]
>> So I think we either need the flag or disable RFC 3927 by default on 
>> dual-stack hosts.
> 
> RFC 2563 already specifies a protocol to turn off ipv4 LLs.

Yes, an IPv4-based mechanism. The proposal stipulates that we want a mechanism for IPv6-only networks to signal to dual-stack hosts, as did draft-ietf-sunset4-noipv4. That is of course looking to the future, not to most current networks.

    Brian

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