Windows 10 change MTU It is possible to change the MTU from the command line. Open the command Prompt window and follow the steps below to change the MTU size: Type “netsh interface ipv4 show subinterface”. Press Enter. You will see a list of network interfaces. Type “netsh interface ipv4 set subinterface ` Local Area Connection ` mtu=1472 store=persistent”. You should replace Local Area Connection with the name that appeared in the “Interface” column from steps 1-3. Press Enter. Type “netsh interface ipv4 show subinterface” to check the result.