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HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\ interface-name

Data type


Default value


0–6 ( 100-millisecond intervals )



Specifies the time interval that defines the end of a segment stream. When this interval elapses between the receipt of TCP segments, TCP considers the segment stream to be complete, and it sends an ACK message to acknowledge the segment. Otherwise, TCP acknowledges every other segment only.

This interval is used in TCP's delayed acknowledgment strategy, in accordance with RFC 1122, Requirements for Internet hosts—communication layers.

Note Image Note

Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.

Caution Image Caution

Do not change this value without careful study of the environment.