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Re: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 19 October 2018 19:37 UTC

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Subject: Re: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt
To: Mikael Abrahamsson <swmike@swm.pp.se>, Ole Troan <otroan@employees.org>
Cc: 6man WG <ipv6@ietf.org>
References: <153973137181.9473.10666616544238076833@ietfa.amsl.com> <092346e1-6350-e54e-e711-9c5ee6dc4e6b@gmail.com> <CAFU7BASO_ByzbanhLKnWV280O_fASd-8W+ujpj3sN6d2-whw2w@mail.gmail.com> <CACWOCC-u7aAPwAOcixYvt2On=-o_8X25GhqdXTfA+tWRC1o2XA@mail.gmail.com> <alpine.DEB.2.20.1810191534430.26856@uplift.swm.pp.se> <422E06B9-8A68-4905-9901-7F4E201ADAB2@employees.org> <alpine.DEB.2.20.1810191557270.26856@uplift.swm.pp.se>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Sat, 20 Oct 2018 08:37:14 +1300
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On 2018-10-20 03:00, Mikael Abrahamsson wrote:
> On Fri, 19 Oct 2018, Ole Troan wrote:
> 
>> There should be a SHOULD disable IPv4 processing on the interface in there somewhere.
>> If it is not then I think the SHOULD MUST be added.
> 
> "A host that receives only RAs with the flag set to 1 SHOULD NOT
>     attempt any IPv4 operations, unless it subsequently receives at least
>     one RA with the flag set to zero.  As soon as such an RA is received,
>     IPv4 operations SHOULD be started."
> 
> The word "MUST" is never used in the document as a requirement to turn off 
> IPv4. The only must is here (why isn't it upper case BTW?):

Good catch, thanks.

> 
> "If a default router expires (i.e.,
>     no RA is received that refreshes its lifetime), the host must remove
>     this router's flag value from consideration."
> 

    Brian

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