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[DSL] Win7 64 MTU stuck at 1440

• Traditional MTU tools such as Dr TCP won't work on Windows Vista/Win7 and if you wish to change your MTU settings these have to be configured manually.

• You need to run and elevated command prompt. Click Start > All Programs > Accessories, right-click Command Prompt and Run as administrator, Allow it to have administrator privileges, otherwise it won't work.

• This will show you what you MTU is set at:
netsh interface ipv4 show subinterfaces

• Then to set the MTU:
netsh interface ipv4 set subinterface "Local Area Connection" mtu=xxxx store=persistent

Where xxxx = the MTU that you want.

• If you have a router, ensure that the MTU is set to the MTU set above.
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"You can observe a lot by watching". Yogi Berra

very informative,,