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How to change the default MTU for PPP and VPN connections ?

The following applies to Windows XP Pro, 2000 server, and 2003 server.

To change the MTU setting for PPP connections:

1. Navigate to Start > Run, type: regedit, find the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NdisWan\Parameters
2. Add a "Protocols" subkey, add a "0" (zero) subkey to the Protocols subkey as well.
3. Add the following new DWORD values to the "0" subkey you created:
"ProtocolType=800" (hexadecimal)
"PPPProtocolType=21" (hexadecimal)
"ProtocolMTU=nnn" (decimal, where nnn is the desired MTU value)
4. Restart your PC.


To change the MTU setting for VPN connections:

1. Navigate to Start > Run, type: regedit, find the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NdisWan\Parameters
2. Add a "Protocols" subkey, add a "0" (zero) subkey to the Protocols subkey as well.
3. Add the following new DWORD values to the "0" subkey you created:
"ProtocolType=800" (hexadecimal)
"PPPProtocolType=21" (hexadecimal)
"TunnelMTU=nnn" (decimal, where nnn is the desired MTU value)
4. Restart your PC.



References:
MSKB 826159


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