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By default, a Windows XP PPPoE connection uses an MTU size that is 20 bytes less than the IP MTU of the LAN adapter over which the PPPoE packets are sent, which in most cases is 1480 bytes. If a lower MTU is required, then this tweak can be used to change the value.

Open your registry and find the key below.

Create three new DWORD values called "ProtocolType", "PPPProtocolType" and "ProtocolMTU". Set their values according to the table below.

• ProtocolType = "2048" (in decimal)
• PPPProtocolType = "33" (in decimal)
• ProtocolMTU = to the required MTU size. (Windows will use the lesser of this value and the default.)

Note: The default and maximum PPPoE MTU size in Windows XP is 1,480 bytes.

		(Default)	REG_SZ	(value not set)
		ProtocolType	REG_DWORD	0x00000800 (2048)
		PPPProtocolType	REG_DWORD	0x00000021 (33)
		ProtocolMTU	REG_DWORD	0x000005c8 (1480)

	HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Ndiswan\Parameters\...

Related Tweaks

• Optimize Broadband PPPoE Connections (Windows Me)
• Change the Maximum Transmission Unit (MTU) Size (Windows NT/2000/XP)

Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.