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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