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~~

If three duplicate ACKs are received, Reno will

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

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* 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.

{| class="wikitable"

|-

! Event !! Tahoe !! Reno

|-

| 3 Dup Acks || performs a fast retransmit<br> Sets the slow start threshold to half of the current congestion window<br>Reduces the congestion window to 1 MSS<br>Resets to slow start state|| perform a fast retransmit

|-

| RTOs || Example || Example

|-

| Example || Example || Example

|}

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