Enable MTU Discovery (Windows 95/98/Me)

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

Enable MTU Discovery (Windows 95/98/Me)
Category: Home > Network > Protocols > TCP-IP

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This setting specifies whether the TCP/IP stack will attempt to perform path MTU discovery as specified in RFC 1191.

Open your registry and find the key below.

Create a new string value (or DWORD value for Windows 95) named "PMTUDiscovery" and set it to equal "1" to enable discovery or "0" to disable it.

Restart Windows for the change to take effect.


(Default)	REG_SZ	(value not set)
PMTUDiscovery	REG_SZ	1


	HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP

Settings:

System Key: [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP]
Name: PMTUDiscovery
Type: REG_SZ (String Value)
Value: (0 = disabled, 1 = enabled)

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 13, 2002

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