Starting with SP2, Windows NT can implement the Van Jacobson TCP fast retransmit and recovery algorithm to quickly retransmit missing segments upon the receipt of n ACKS, without waiting for the retransmission timer to expire.
To implement the Van Jacobson algorithm, edit:
HKEY_LOCAL_MACHINE/SYSTEM/currentcontrolset/services/tcpip/parameters
Add Value name TcpMaxDupAcks, a type REG_DWORD, and set the value to the n (number) of ACKs. The range is 1-3 and the default is 2.
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