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Other Differences Changes made based on lessons learned from LOWPAN_HC1 implementations Possible lack of octet alignment Can consume several hundred bytes of code Octet alignment broken in uncommon cases Saves at most one octet in best case (when used with HC_UDP) HC1g include 4-bit version field with Traffic Class and Flow Label HC_UDP not possible when using IP extension headers HC2 bit changed to specify layer 4 compression Only UDP is currently valid, ICMP/TCP not yet defined |