Modify the Number of Duplicate ACKs for Fast Retransmit (Windows 2000/XP)

Registry Guide for Windows
Part of the WinGuides Network

Registry tweaks, tricks & hacks to optimize, enhance and secure Microsoft Windows.

Modify the Number of Duplicate ACKs for Fast Retransmit (Windows 2000/XP)
Category: Home > Network > Protocols > TCP-IP

This tweak can be easily applied using WinGuides Tweak Manager.
Download a free trial now!

This parameter determines the number of duplicate ACKs that must be received for the same sequence number of sent data before "fast retransmit" is triggered to resend the segment that has been dropped in transit.

Open your registry and find the key below.

Create a new DWORD value, or modify the existing value called 'TcpMaxDupAcks' using the settings below.

Exit your registry, you may need to restart or log out of Windows for the change to take effect.


(Default)	REG_SZ	(value not set)
TcpMaxDupAcks	REG_DWORD	0x00000002 (2)


	HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters

Settings:

System Key: [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters]
Name: TcpMaxDupAcks
Type: REG_DWORD (DWORD Value)
Value: 1-3 (default =2)

Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.

Last Modified: May 14, 2002

Return to Index