Detect Black Hole Routers During Path MTU Discovery (Windows NT/2000/XP)
Category: Home > Network > Protocols > TCP-IP
Specifies whether the stack will attempt to detect Maximum Transmission Unit (MTU) routers that do not send back ICMP fragmentation-needed messages.
Open your registry and find the key below.
Create a new DWORD value, or modify the existing value called 'EnablePMTUBHDetect' 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) | |
|  | EnablePMTUBHDetect | REG_DWORD | 0x00000001 (1) | |
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| HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters |  |
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| Settings: |
System Key: [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters]
Name: EnablePMTUBHDetect
Type: REG_DWORD (DWORD Value)
Value: (0 = false, 1 = true)
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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.
Last Modified: May 14, 2002
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