7. 7 Chapter 13 Transmission Control Protocol (TCP) Retransmission and Time-Out.

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Presentation transcript:

7

7 Chapter 13 Transmission Control Protocol (TCP) Retransmission and Time-Out

Retransmission Time-Out and Round-Trip Time

The RTO should be neither too large nor too small to prevent the following behaviors: Retransmission Time-Out and Round-Trip Time

Congestion Collapse Retransmission Time-Out and Round-Trip Time

Retransmission Behavior

Retransmission Behavior for New Connections Retransmission Behavior

Dead Gateway Detection Retransmission Behavior

When the router at fails, dead gateway detection uses the following process to change the default route to use the next-hop IP address of : Retransmission Behavior

Forward RTO-Recovery Retransmission Behavior

Using the Selective Acknowledgment (SACK) TCP Option Retransmission Behavior

Using SACKs to Indicate Duplicate Received Packets Retransmission Behavior

Calculating the RTO

Using the TCP Timestamps Option

TCP Timestamps

Karns Algorithm TCP Timestamps

Karns Algorithm and the Timestamps Option TCP Timestamps

Fast Retransmit and Fast Recovery

Fast Recovery Fast Retransmit and Fast Recovery

SACK-based Loss Recovery Fast Retransmit and Fast Recovery

New Reno Support for Fast Recovery Fast Retransmit and Fast Recovery

Summary