The default in MOL is to use ethertap and set up masquerading to your standard NIC, however, there is also a driver called sheep which connects MOL directly to your NIC. With sheep you just assign MOL a vacant IP that works on your subnet and you are good to go. I would recommend that you try the sheep device since it is much easier to set up (it should work out-of-the-box). Simply modify /etc/mol/molrc.net to load sheep as the default driver.