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Split a TCP connection at the foreign agent into two TCP connections

Hosts in the fixed part of the network do not notice the characteristics of the wireless part. No changes to the TCP protocol for hosts connected to the wired Internet, millions of computers use (variants of) this protocol

Optimized TCP protocol for mobile hosts.

The access point acts as proxy in both directions.

AP acknowledges to both the sender and receiver.

Re-transmission on wireless links is handled locally.

During handover, the buffered packets, as well as the system state (packet sequence number, acknowledgments, ports, etc), must migrate the new agent.