The Maximum Transmission Unit (MTU) is the maximum size of a data packet that a network router can receive. Microsoft Windows Server 2003, Microsoft Windows 2000 and Microsoft Windows XP use a default MTU size of 1,500 bytes for all Point-to-Point Protocol connections and a default MTU size of 1,400 bytes for all Virtual Private Network connections. When the size of a packet that a network router receives is larger than the MTU, it returns the "destination unreachable" message to the sending host. If the current MTU on a PC makes it difficult for users to access required applications, you can change the MTU setting on your PC.

Instructions

1

Click the "Start" button, click "Run," type "regedit" and then click "OK."

2

Locate and then click the following key in the registry: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Ndiswan\Parameters

3

Click "Edit," select "New" and then click "Key." Type "0" and press the "Enter" key.

4

Click "Edit," select "New" and then click the "DWORD Value." Type "ProtocolType" and press the "Enter" key.

5

Click "Edit" and then click "Modify." Type "800" and then click "OK."

6

Click "Edit," select "New" and then click "DWORD Value." Type "PPPProtocolType" and press the "Enter" key.

7

Click "Edit" and then click "Modify." Type "21" and then click "OK."

8

Click "Edit," select "New" and then click "DWORD Value." Type "ProtocolMTU" and press the "Enter" key.

9

Click "Edit" and then click "Modify." Type the new MTU size and then click "OK" to change MTU setting on your computer.

10

Click "File" and then click "Exit" to quit the Registry Editor.