When the multi-hop NS is sent from the LR to the LBR, its hop limit is
set to 255 and then decremented on each hop. When it arrives at the
LBR, the hop limit=255 check is ignored. There are a couple of problems
with this mechanism:-
(1) If the packet enters a routing loop, it will take a long time to die.
(2) Some stacks have a rule that packets with a hop limit of 255 should
never be forwarded by the routing layer or a hop limit of 254 should
never be transmitted.
These problems could be addressed by setting the hop limit to a more
typical value, e.g. 64, for the multi-hop messages.
Regards,
Daniel.
--
__________________________________________________
Daniel Gavelle, Software Team Leader
Low Power RF Solutions (formerly Jennic Ltd.)
NXP Semiconductors
Furnival Street, Sheffield, S1 4QT, UK
Tel: +44 114 281 2655
Fax: +44 114 281 2951
Comp Reg No: 3191371 - Registered In England
http://www.nxp.com http://www.jennic.com
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