hello everyone
i need help with setting up the mtu and mru ,
what i want is the best way to choose the best mtu and mru , is there a scanner or idk what to do to see the best settings ???

Make sure that you need to modify these values, as probably you do not have any problems.
You may start from the lower value (1300-1350) and go until it will stop working (make sure that you need to modify these values).