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An introduction to TCP and its modeling

An introduction to TCP and its modeling. By: Amin PourRostami. Internet Protocol (IP). Unreliable Best-Effort End-to-End Data-link protocols. IP Protocol stack. fragmentation time-to-live type-of-service Datagram length. Transmission Control Protocol (TCP). Multiplexed Duplex

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An introduction to TCP and its modeling

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  1. An introduction to TCP and its modeling By: Amin PourRostami

  2. Internet Protocol (IP) • Unreliable • Best-Effort • End-to-End • Data-link protocols

  3. IP Protocol stack • fragmentation • time-to-live • type-of-service • Datagram length

  4. Transmission Control Protocol (TCP) • Multiplexed • Duplex • Connection-oriented • Reliable • Flow-controlled • Byte-stream

  5. TCP Protocol Stack

  6. Flow Control RTT source sink λ µ • Open-Loop • Conflicting requirements • Traffic descriptors • Peak and average rates • Linear bounded arrival processes • Closed-Loop • … B 0

  7. Flow Control • Closed-loop Cntd.

  8. TCP Flow Control • TCP-Tahoe • Detects losses using timeouts • Decreases the flow control window to 1 • Ssthresh = , slow-start, congestion-avoidance • TCP-Reno • Detects losses using both timeouts and three duplicate ACKs • Timeout -> Tahoe • Fast retransmit ->congestion-avoidance->continues even if D-ACKs received • Exponential back-off • TCP-SACK • Selective ACKs • TCP-Vegas • Described later • …

  9. TCP-Reno modelling Congestion avoidance Fast retransmit Slow start Exponential backoff

  10. TCP-Vegas Modelling • Adaptive scheme

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