A Protocol for Packet Network Intercommunication

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A Protocol for Packet Network Intercommunication

• Wei Zhang (wez5_at_lehigh.edu)

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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

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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
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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)

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Solutions from the paper

• Flow Control
• Avoid overwhelming the recipients.
• Connections and Associations
• Unlike circuit switching network, theres not a
  fixed path between two hosts. The path may vary,
  depending on the networking environment.