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

Alexandre Petrescu <alexandre.petrescu@gmail.com> Wed, 11 September 2019 08:55 UTC

Subject: Re: Question for w.g. on <<draft-ietf-6man-ra-pref64-04>
To: Bob Hinden <bob.hinden@gmail.com>
Cc: IPv6 List <ipv6@ietf.org>
References: <6C018A55-208A-4BB5-9DDD-9C035A882227@gmail.com> <ac9315f1-6708-abbd-42d9-3fe8b57cf8fa@gmail.com> <4FA67CAC-3FC3-42F0-9AD2-C754EF6717F3@gmail.com>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
Message-ID: <6c1546d1-c2e7-b428-1e7c-c320b34f0886@gmail.com>
Date: Wed, 11 Sep 2019 10:55:01 +0200
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Le 10/09/2019 à 17:04, Bob Hinden a écrit :
> Alex,
> 
>> On Sep 10, 2019, at 4:30 AM, Alexandre Petrescu <alexandre.petrescu@gmail.com> wrote:
>>
>>
>>
>> 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.
> 
> That how it is defined in RFC6052.   See Section 2 of RFC6052.

Thank you for the pointer.  It says that the plen can only be like that: 
32, 40, etc.  It can't be 33, for example.

Alex

> 
> Bob
> 
>

Question for w.g. on <<draft-ietf-6man-ra-pref64-… Bob Hinden
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Erik Kline
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Alexandre Petrescu
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Alexandre Petrescu
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Bob Hinden
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Erik Kline
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Alexandre Petrescu
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Gyan Mishra
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Jen Linkova
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Gyan Mishra
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Jen Linkova
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Ole Troan
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Bob Hinden
Re: Question for w.g. on <<draft-ietf-6man-ra-pre… Gyan Mishra