Detect Black Hole Routers During Path MTU Discovery (Windows NT/2000/XP)

Specifies whether the stack will attempt to detect Maximum Transmission Unit (MTU) routers that do not send back ICMP fragmentation-needed messages.

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

Open your registry and find or create the key below.

Create a new DWORD value, or modify the existing value, called "EnablePMTUBHDetect" and set it according to the value data 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)
		EnablePMTUBHDetect	REG_DWORD	0x00000001 (1)

	HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\P...

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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.