Check MTU (Maximum Transmission Unit) on Windows 11

1. Run the command prompt as admin.
2. Command for show interface MTU.

netsh interface ipv4 show subinterfaces

3. Command for changing the MTU.

netsh interface ipv4 set subinterface "Interface name" mtu=1492 store=persistent

4. Restart the computer for the change.
5. Use the command show MTU to confirm that the MTU was changed.

netsh interface ipv4 show subinterfaces