Tag
sack
- Dec 4, 2025 Duplicate Acknowledgements and How a Sender Distinguishes Loss from Reordering Three duplicate ACKs are a heuristic for one lost segment, not a proof. Fast retransmit and fast recovery act on it, and the ambiguity with packet reordering shapes the whole design. networking
- Jun 5, 2025 SACK Blocks and the Retransmission Queue How selective acknowledgement turns a cumulative ACK into a map of received ranges, why the sender keeps a scoreboard, and what the option length limit costs. networking