Change/Fix MTU on Windows XP

Windows XP use a fixed maximum transmission unit (MTU) size of 1500 bytes for all PPP connections and use a fixed MTU size of 1400 bytes for all VPN connections. However, you may experience a VPN or Internet drop or slow issues with these default MTU settings, especially if you are using a DSL line. This step-by-step article describes how to modify the default MTU size settings for Point-to-Point Protocol (PPP) connections or for virtual private network (VPN) connections.

 

How to modify the MTU Settings for VPN Connections on XP ?

  1. you can follow this tutorial
  2. Download and apply our registry key http://billing.hideipvpn.com/dl.php?type=d&id=26

 

To modify the MTU settings for VPN connections, you need to add the ProtocolType DWORD value, the PPPProtocolType DWORD value, and the TunnelMTU DWORD value to the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Ndiswan\Parameters\Prot ocols\0

To do so, follow these steps.

  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate and then click the following subkey in the registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NdisWan\Parameters
  3. Add a Protocols subkey (if it does not already exist). To do so:
    a. On the Edit menu, point to New, and then click Key.
    b. Type Protocols, and then press ENTER.
  4. Add a 0 (zero) subkey to the Protocols subkey. To do so:
    a. Click the Protocols sub key that you created in step 3.
    b. On the Edit menu, point to New, and then click Key.
    c. Type 0 (zero), and then press ENTER.
  5. Click the 0 subkey that you created in step 4.
  6. On the Edit menu, point to New, and then click DWORD Value.
  7. In the Value data box, type ProtocolType, and then click OK.
  8. On the Edit menu, click Modify.
  9. In the Value data box, type 800, make sure Hexadecimal is selected under Base, and then click OK.
  10. On the Edit menu, point to New, and then click DWORD Value.
  11. Type PPPProtocolType, and then press ENTER.
  12. On the Edit menu, click Modify.
  13. In the Value data box, type 21, make sure Hexadecimal is selected under Base, and then click OK.
  14. On the Edit menu, point to New, and then click DWORD Value.
  15. Type TunnelMTU, and then press ENTER.
  16. On the Edit menu, click Modify.
  17. Under Base, click Decimal, type the MTU size that you want (e.g. 1460) in the Value data box, and then click OK.
  18. Quit Registry Editor.
  19. Restart your computer.

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