Use the following command to get the currently available interfaces and the MTU. In this example, the MTU of "Local Area Connection" is 1500.
PS C:\ > netsh interface ipv4 show interfaces
Idx Met MTU State Name
--- --- ---- --------- ---------------------
1 25 1500 connected Local Area Connection
Use the following command to change the MTU. In this example, the MTU is doubled to 3000.
Run the first command again to ensure the MTU has been updated.
PS C:\ > netsh interface ipv4 show interfaces
Idx Met MTU State Name
--- --- ---- --------- ---------------------
1 25 3000 connected Local Area Connection