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Re: Question for w.g. on <<draft-ietf-6man-ra-pref64-04>

Alexandre Petrescu <alexandre.petrescu@gmail.com> Tue, 10 September 2019 11:30 UTC

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Subject: Re: Question for w.g. on <<draft-ietf-6man-ra-pref64-04>
To: Bob Hinden <bob.hinden@gmail.com>, IPv6 List <ipv6@ietf.org>
References: <6C018A55-208A-4BB5-9DDD-9C035A882227@gmail.com>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Tue, 10 Sep 2019 13:30:19 +0200
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Le 09/09/2019 à 20:38, Bob Hinden a écrit :
> Hi,
> 
>  From my reading of the list for <draft-ietf-6man-ra-pref64-04>, we have a choice between the format described in the draft:
> 
>       0                   1                   2                   3
>       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      |     Type      |    Length     |           Lifetime            |
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      |                                                               |
>      +                                                               +
>      |              Highest 96 bits of the Prefix                    |
>      +                                                               +
>      |                                                               |
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      | Lowest bits (96-127) of the prefix (optional, if Length > 2)  |
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      | Prefix Length |                  Reserved                     |
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> 
> This format supports two lengths of the option (20 & 28 bytes) and allows for different NAT64 prefix lengths in the 28 byte version.
> 
> Based on the chairs comments and list discussion, the following format has been proposed:
> 
>       0                   1                   2                   3
>       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      |     Type      |    Length     |       Lifetime          |  PL |
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      |                                                               |
>      +                                                               +
>      |              Highest 96 bits of the Prefix                    |
>      +                                                               +
>      |                                                               |
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> 
> This allow for the ranges of prefix lengths (32, 40, 48, 56, 64) supported by NAT64 (RFC6052) and is 20 bytes long.

I do not understand why the 8bit boundary and why the 32bit lower 64bit 
upper limits.  That is my oppinion.

Alex

> 
> The merits of these formats has been discussed.
> 
> Please read the discussion and respond with your preference.  It would be good to hear from people who haven’t responded so far.
> 
> Thanks,
> Bob
> 
> 
> 
> 
> 
> 
> 
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