1. A Protocol for Packet Network Intercommunication Wei Zhang (wez5@lehigh.edu)

2. Introduction Why interconnect?  Facilitate the sharing of computer resources. Difficulty in intercommunication  Each network may have distinct addressing scheme.  Each network may accept data of different maximum size.  The success or failure of a transmission  Recovery from the communication disruption

3. An important concept GATEWAY  It is an interface between networks and plays a central role.  It routes the data in a store and forward fashion. So it works like an interpreter.  It is critical for the implementation of the intercommunication. Network 1 Network 2 GATEWAY

4. Solutions from the paper Address Formats Segmentation and Reassembly  Due to the different MTU in each network. Retransmission and Duplicate Detection  Guarantee the correctness of the transmission. Network (8 bits) TCP Identifier (16 bits)

5. Solutions from the paper Flow Control  Avoid overwhelming the recipients. Connections and Associations  Unlike circuit switching network, there’s not a fixed path between two hosts. The path may vary, depending on the networking environment.