Tweaking DSL Speed MTU Size Setting in Windows XP

Written by on Thursday, January 3, 2008 5:11 - 0 Comments

How to change the MTU size for PPPoE connections.

The default Maximum Transmission Unit (MTU) size for PPPoE (DSL) connections in Windows XP is typically set to 1,480 or 1,490 bytes. However if find you can’t browse some Web sites or send e-mail messages with attachments, your DSL connection may work better with a slightly lower MTU size setting (somewhere between 1,400 to 1,490). You can refer to another tip on this site for information on how to test out what MTU size is best for your Internet connection.

To edit the MTU size in Windows XP, you must first add the following keys to the Windows Registry:

Key: SystemCurrentControlSetServicesNdiswanParametersProtocols

Key: SystemCurrentControlSetServicesNdiswanParametersProtocols

Then add the following entries to the 0 key:

Name: ProtocolType
Value: 0x00000800

Name: PPPProtocolType
Value: 0x00000021

Name: ProtocolMTU
Value: desired MTU size ')}

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