Enable Black Hole Detection
Specifies whether the stack will attempt to detect Maximum Transmission Unit (MTU) routers that do not send back ICMP fragmentation-needed messages. The default is 0.
Enable automatic MTU Detection
Specifies whether the TCP/IP stack will attempt to perform path MTU discovery as specified in RFC 1191. The default is 1.
Enable SACK (Selective Acknowledge)
This parameter controls whether or not Selective ACK (SACK - RFC 2018) support is enabled. With SACK enabled (default), a packet or series of packets can be dropped, and the receiver informs the sender which data has been received, and where there may be "holes" in the data.