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

Bob Hinden <bob.hinden@gmail.com> Mon, 09 September 2019 18:38 UTC

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From: Bob Hinden <bob.hinden@gmail.com>
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Subject: Question for w.g. on <<draft-ietf-6man-ra-pref64-04>
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Date: Mon, 09 Sep 2019 11:38:29 -0700
Cc: Bob Hinden <bob.hinden@gmail.com>
To: IPv6 List <ipv6@ietf.org>
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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.

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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