JSI Tip 5213. How do I change the PPPoE MTU size, required by my ISP, in Windows XP?

If your ISP requires a maximum PPPoE MTU size of less than the default 1,480 bytes, you can add some registry entries to change it.

NOTE: DO NOT set the MTU size lower than 1,400.

NOTE: Changing the MTU size using the Value Names in this tip will affect all RAS connections except PPTP (Point-to-Point Tunneling Protocol) and L2TP (Layer 2 Tunneling Protocol).

To set the PPPoE MTU size:

1. Use the Registry Editor to navigate to:

HKEY_LOCAL_MACHINESystemCurrentControlSetServicesNdiswanParameters.

2. Add the following REG-DWORD data types:

3. Exit the Registry Editor.