< draft-thubert-6lo-forwarding-fragments-00.txt   draft-thubert-6lo-forwarding-fragments-01.txt >
ROLL P. Thubert, Ed. ROLL P. Thubert, Ed.
Internet-Draft cisco Internet-Draft cisco
Intended status: Standards Track J.W. Hui Intended status: Standards Track J.W. Hui
Expires: April 18, 2014 Cisco Expires: August 16, 2014 Cisco
October 17, 2013 February 14, 2014
LLN Fragment Forwarding and Recovery LLN Fragment Forwarding and Recovery
draft-thubert-6lo-forwarding-fragments-00 draft-thubert-6lo-forwarding-fragments-01
Abstract Abstract
In order to be routed, a fragmented packet must be reassembled at In order to be routed, a fragmented packet must be reassembled at
every hop of a multihop link where lower layer fragmentation occurs. every hop of a multihop link where lower layer fragmentation occurs.
Considering that the IPv6 minimum MTU is 1280 bytes and that an an Considering that the IPv6 minimum MTU is 1280 bytes and that an an
802.15.4 frame can have a payload limited to 74 bytes in the worst 802.15.4 frame can have a payload limited to 74 bytes in the worst
case, a packet might end up fragmented into as many as 18 fragments case, a packet might end up fragmented into as many as 18 fragments
at the 6LoWPAN shim layer. If a single one of those fragments is at the 6LoWPAN shim layer. If a single one of those fragments is
lost in transmission, all fragments must be resent, further lost in transmission, all fragments must be resent, further
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