To change the TCP Selective Acknowledgement option through the user Operations Interface, enter the following:

NW TCPIP OPT + SACK

Multiple packet loss from a window of data can cause TCP to lose its ACK-based clock, reducing overall throughput.

TCP Selective Acknowledgment (SACK) provides a mechanism where the data receiver can inform the sender about all the segments that have successfully arrived. This provides the required information to allow the sender to retransmit only the segments that are lost. This reduces the overall number of retransmits that are generally made on multiple packet loss. SACK is described in RFC 2018 and extended by RFCs 2883 and 3517.

The default is value is “+” (ON).