PfSense 2.0.3 with Realtek RTL8111E Gigabit LAN
Does pfSense 2.0.3 support Realtek RTL8111E Gigabit LAN Ports?
There are a number of hardware revisions of that chip. I think some of the early ones are supported I think but anything released recently is not. All are supported by 2.1 though. There are also some updated drivers that support more revisions, but not all, for 2.0.X: