Re: [manet] DYMO Address Prefix length: discrepancy between DYMO and PacketBB drafts

Thanks for the comment. DYMO will agree with PacketBB.

DYMO-04 contains several typos related to packetbb, these should be
fixed in the next revision. If you find any others please feel free to
email me.

Ian Chakeres

On 4/20/06, Ulrich Meis <meis@i4.informatik.rwth-aachen.de> wrote:
> DYMO in all drafts states that if the prefix field is missing the prefix
> length is assumed to be 0.
> PacketBB on the other hand states that the prefix length, if absent, is
> considered to be equal to the address length. Certainly, this makes more
> sense and saves implementations from having to handle this case differently.
>
> My guess is that DYMO has adopted its default from AODV where 31 is the
> maximum for this field since it has only 5 bits. IPv4's address length of 32
> cannot be represented. Although DYMO in draft 03 already reserved 6-7 bits
> for this field(depends if you read page 7 or 12).
>
> In my opinion DYMO and PacketBB should have the same prefix length semantics.
> However, if that is not desired, I'd suggest to state this fact in upcoming
> DYMO drafts to avoid confusion.
>
> Relevant sections:
> ------------------------------------
> draft-ietf-manet-dymo-04.txt
> Page 10:
>
> RM should contain a Prefix for each address that is not a host
>          address.  If a prefix is not included in conjunction with an
>          address, it is assumed zero (host address only).  For more
>          information on advertising a Prefix see Section 4.7.
>
> ------------------------------------
> draft-ietf-manet-packetbb-00.txt
> Page 13:
>
> An address SHALL NOT appear more than once in the same message
>       with the same prefix length (an address without a PREFIX-LENGTH
>       TLV is considered to have a prefix length equal to the address
>       length);
>
> ------------------------------------
>
>
> Thanks,
>
> Uli
>
>
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