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

Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com> Thu, 16 May 2019 07:56 UTC

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To: ipv6@ietf.org
Subject: Re: Alternatives to the flag (Was:Confirmation to advance: draft-ietf-6man-ipv6only-flag-05)
From: Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>
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In-reply-to: Your message of "Wed, 15 May 2019 14:34:29 +0100 ." <a646a186-be05-cdff-c8e4-61cf09930494@foobar.org>
Date: Thu, 16 May 2019 09:56:30 +0200
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>> 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.

Keeping IPv4 link local off by default on links with IPv6 provides a clear
path forward to IPv6-only. It provides a clear expectation that without
DHCPv4 there will be no IPv4.

I.e., IPv4 should be off by default and not something that needs to be
filtered. 

Of course that doesn't kill DHCPv4 DISCOVER. But that is something I think
we can live with until hosts have their IPv4 stacks turned off by default.

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