How to change mtu

How to change MTU settings

By default, Windows Server 2003, 2000 and 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 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. Here are some symptoms:

"The Network name is no longer available"

VPN drops the connection.

VPN is very slow.

To change the MTU Settings, select the the following options how to accordingly.

How to determine the optimal MTU

How to modify the MTU Settings for PPP Connections

How to modify the MTU Settings for VPN Connections

Warning from Microsoft: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry