There is a difference in type of messages:
6lowpan-ND messages (which stay in the 6lowpan network) should specify
their Hop Limit value, more precisely than just the current vague "255
or less".
Any other IP non-6lowpan-ND messages' Hop Limit should be left to the
other non-6lowpan-ND protocols to specify.
(An IP UDP message sent by a node in the 6lowpan network should be able
to reach a correspondent node on the other side of the Internet, i.e.
its Hop Limit to be as large as it could.)
("should" but IMHO).
Alex
Le 18/10/2010 10:09, Zach Shelby a écrit :
Daniel,
The draft doesn't actually specify that you must use a hop limit of 255.
Section 8.2.3 states:
"In the IPv6 hop limit, 255 or a smaller number."
We will definitely try to clarify this better in the text of the next revision
though, this could be interpreted now as recommending the use of 255.
Thanks,
Zach
On Oct 18, 2010, at 11:01 AM, Daniel Gavelle wrote:
I agree that we don't need a hardwired constant. However, the 6LowPAN-ND draft
currently specifies a hop limit of 255 for multihop messages. I think we
should change the text to make it clear that the hop limit should be set to the
same value as a normal multihop message (e.g. a UDP message) sent to the LBR.
Daniel.
Carsten Bormann wrote:
On Oct 13, 2010, at 14:30, Daniel Gavelle wrote:
These problems could be addressed by setting the hop limit to a more typical
value, e.g. 64, for the multi-hop messages.
Sounds good to me.
Multihop messages between 6LR and 6LBR definitely don't need the HL=255 trick,
so the nodes should be free to choose a hop limit that is appropriate for the
network they are in.
I don't think we want to hardwire a suggestion for the 'hop limit' value in the
draft (although a number around 64 sounds like a good implementation default).
Gruesse, Carsten
Regards,
Daniel.
--
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Daniel Gavelle, Software Team Leader
Low Power RF Solutions (formerly Jennic Ltd.)
NXP Semiconductors
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Tel: +44 114 281 2655
Fax: +44 114 281 2951
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