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Lost packets on the wireless link (both directions!) will be retransmitted immediately by the mobile host or foreign agent, respectively (so called “local” retransmission)
The foreign agent therefore “snoops” the packet flow and recognizes acknowledgements in both directions, it also filters ACKs
Handover is easy. I-TCP requires a careful handover of the system state. Here it falls back to the standard solution if no enhancements.