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Re: [v6ops] Suresh Krishnan's Yes on draft-ietf-v6ops-conditional-ras-06: (with COMMENT)

Suresh Krishnan <suresh.krishnan@gmail.com> Wed, 15 August 2018 15:45 UTC

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From: Suresh Krishnan <suresh.krishnan@gmail.com>
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Date: Wed, 15 Aug 2018 11:44:58 -0400
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Cc: Jen Linkova <furry13@gmail.com>, v6ops@ietf.org, russ@riw.us, v6ops-chairs@ietf.org, draft-ietf-v6ops-conditional-ras@ietf.org, The IESG <iesg@ietf.org>
To: 神明達哉 <jinmei@wide.ad.jp>
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Subject: Re: [v6ops] Suresh Krishnan's Yes on draft-ietf-v6ops-conditional-ras-06: (with COMMENT)
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Hi Jinmei-san,

> On Aug 10, 2018, at 1:27 PM, 神明達哉 <jinmei@wide.ad.jp <mailto:jinmei@wide.ad.jp>> wrote:
> 
> At Fri, 10 Aug 2018 22:25:50 +1000,
> Jen Linkova <furry13@gmail.com <mailto:furry13@gmail.com>> wrote:
> 
> > I've added a paragraph clarifying that we only modify preferred
> > lifetime and that RFC4862 does not
> > allow an RA with both preferred and valid lifetime for the prefix set
> > to 0 to invalidate the address completely:
> > 
> > https://tools.ietf.org/html/draft-ietf-v6ops-conditional-ras-07 <https://tools.ietf.org/html/draft-ietf-v6ops-conditional-ras-07>
> 
> To be very accurate, it's still allowed if the RA is authenticated:
> 
>           Neighbor Discovery [RFC3971]).  If the Router Advertisement
>           was authenticated, the valid lifetime of the corresponding
>           address should be set to the Valid Lifetime in the received
>           option.
> 
> (whether v6ops-conditional-ras should be this accurate is a different
> question, for which I don't have a strong opinion)

Yes. You are absolutely correct, but given the lack of deployment of SEND this pretty much means that this will be a no-op. To allow for wiggle room we can add something like “in most cases” to qualify the new text regarding valid lifetime.

Thanks
Suresh

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