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T CP Connection Management

T CP Connection Management. Created by M Bateman, A Ruddle & C Allison As part of the TCP View project. C onnections. Both sender an receiver must be ready before start of data transfer Sender and receiver need to agree on parameters Receive buffer size, initial sliding window variables

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T CP Connection Management

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  1. TCP Connection Management Created by M Bateman, A Ruddle & C Allison As part of the TCP View project

  2. Connections • Both sender an receiver must be ready before start of data transfer • Sender and receiver need to agree on parameters • Receive buffer size, initial sliding window variables • Sender and receiver must agree when transfer is over • Both sides must discard state • This is signalling • Setup/teardown state at the endpoints • Compare to ‘dialing’ in the telephone network

  3. Connection Management • Setup • 3-way handshake • Transfer • Sliding window, data and ACKs in both directions • Teardown • 4-way handshake • Client-server model • Initiator (client) server • Listener (server) responds, provides service

  4. Connection Creation

  5. Connection Creation

  6. Connection Creation

  7. Connection Creation

  8. Data Transfer • Connection is bi-directional • ACKs can carry data

  9. Connection Teardown

  10. Connection Teardown

  11. Connection Teardown

  12. Connection Teardown

  13. Connection Teardown

  14. The TIME_WAIT State • We wait 2 * maximum segment lifetime (60 seconds) before completing the close • Why? • ACK might have been lost so FIN would be resent • Could interfere with subsequent connections

  15. ‘Two-Army’ Problem • Can we use messages and retries to synchronise two machines so they are guaranteed to do some operation at the same time?

  16. Two-Army Problem

  17. Two-Army Problem

  18. Two-Army Problem

  19. Two-Army Problem

  20. Two-Army Problem

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