Cheatsheet: Difference between revisions

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* Both consider RTO and Duplicate ACKs as packet loss events.

* Behavior of Tahoe and Reno differ primarily in how they react to duplicate ACKs.

Tahoe:

If three duplicate ACKs are received Tahoe performs a fast retransmit

Sets the slow start threshold to half of the current congestion window

Reduces the congestion window to 1 MSS

Resets to slow start state

Reno:

If three duplicate ACKs are received, Reno will perform a fast retransmit

Skip the slow start phase by instead halving the congestion window (instead of setting it to 1 MSS like Tahoe),

Setting the slow start threshold equal to the new congestion window

Enter a phase called fast recovery.

* In both Tahoe and Reno, if an ACK times out (RTO timeout), slow start is used, and both algorithms reduce congestion window to 1 MSS.

* Four ACKs acknowledging the same packet, which are not piggybacked on data and do not change the receiver's advertised window.

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