Ssthresh Plus Three
A Reno sender following RFC 5681 starts a transfer with cwnd = 8 segments and ssthresh = 64 segments. All counts below are in full-sized segments and every segment in a round is acknowledged unless stated.
| Round | cwnd at start | Event | cwnd at end |
|---|---|---|---|
| 1 | 8 | all ACKed, slow start | 16 |
| 2 | 16 | all ACKed, slow start | 32 |
| 3 | 32 | all ACKed, slow start | 64 |
| 4 | 64 | all ACKed, congestion avoidance | 65 |
| 5 | 65 | all ACKed, congestion avoidance | 66 |
| 6 | 66 | three duplicate ACKs arrive, FlightSize = 66 | ? |
After fast retransmit and fast recovery have finished, meaning the ACK covering the retransmitted segment has arrived, what are cwnd and ssthresh?
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