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. Add a "Protocols" subkey, add a "0" (zero) subkey to the Protocols subkey as well. Navigate to Start > Run, type: regedit, find the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NdisWan\Parameters 2. To change the MTU setting for VPN connections: 1. 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. To change the MTU setting for PPP connections: 1. By reducing the MTU size, you can eliminate performance and connectivity issues that occur due to fragmentation when the VPN tunnel connections go through multiple Internet Service Providers (ISPs) and network paths with MTU lower than 1500 bytes. The following applies to Windows XP Pro, 2000 server, and 2003 server.
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