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Motivation Why global addresses? End-to-end communication in networks with heterogeneous links without a stateful (possibly application specific) translation gateway data collection point may be multiple IP hops away End-to-end communication across different PANs IP connects different subnetworks ZigBee does not LOWPAN_HC1 supports arbitrary addresses, but… Only allows compression of the link-local (fe80::/64) prefix Uncompressed addresses consume 32 bytes 1/4th the 802.15.4 MTU before link and 6LoWPAN headers! The Issue is compressing the origin / final IP addresses Not the number of PAN hops between them |