Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-11.txt

Fred Baker <fredbaker.ietf@gmail.com> Thu, 28 September 2017 17:00 UTC

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From: Fred Baker <fredbaker.ietf@gmail.com>
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Date: Thu, 28 Sep 2017 10:00:32 -0700
In-Reply-To: <CAN-Dau162uPx+t_11YBeotzvp2yt5Z-GfS3eGUHoMiBasVGRug@mail.gmail.com>
Cc: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "v6ops@ietf.org" <v6ops@ietf.org>
To: David Farmer <farmer@umn.edu>
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Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-11.txt
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> On Sep 28, 2017, at 7:08 AM, David Farmer <farmer@umn.edu> wrote:
> 
> I like most of the changes, however I find the following bullet somewhat confusing;
> 
> o  Maximum IPv6 Router Advertisement Interval = 300s (or when battery
>    consumption is a concern then a MinRtrAdvInterval of 514 seconds
>    (1/7 of an hour) is better according RFC7772 [RFC7772]).
> 
> It starts out talking about the *Maximum* Router Advertisement Interval, then with little explanation shifts to talking about the *Minimum* Router Advertisement Interval, I fear this will easily confuse any casual readers.  Furthermore, the IPv6 router implementations I'm familiar with, don't allow you to directly set the Minimum Router Advertisement Interval, it is automatically computed as 75% of the Maximum Router Advertisement Interval, as recommended in RFC4861. Therefore, in such implementations the Maximum Router Advertisement Interval would need to be set at 685 seconds.
> 
> Also, as Lorenzo pointed out, there is no discussion of IPv6 Router LifeTime, which is also discussed in RFC7772.

The bit about the inter-router-advertisement interval was at my suggestion. Lorenzo had complained that the draft didn't do anything to meet RFC 7772. That was changed somewhere between -07 and -10. However, it resulted in only specifying MaxRtrAdvInterval. If we want to have no more than seven RAs per hour (per RFC 7772), it is MinRtrAdvInterval that is important. 514=3600/7, hence the specification of MinRtrAdvInterval.

May I suggest you suggest text? What would you like it to say?