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The NACK option: A new NACK option would be defined which contained a 32 bit OFFSET field from the ACK field of the message it is contained in, a 32 bit LENGTH field, and a 32 bit SACKED field which contains the total number of unacknowledged bytes in the receivers buffer. The receiver would keep track of the most recent hole in its receive buffer and if a threshold number of packets beyond this hole were received it would send out a NACK for that hole. The current hole pointer would then be moved to the next hole in the receive buffer (if any). The NACK would contain the offset and length of the hole and the total number of unacknowledged bytes in the buffer. The sender upon receiving a NACK would: 1. Cut the congestion window by 1/2 (al la Reno) 2. Set variable sacked equal to SACKED field in NACK option. 3. Use min(snd_wnd, cwnd+sacked) as the effective window size. 4. Retransmit the offending segment (or segments). 5. Set retransmission timer to at least 1 RTT. ...
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