Ethernet interface

[macotto]

I use Pfsense 1.2.2 in live cd in one computer.
4 Ethernet cards detected : re0 (integrated to motherboard), rl0, rl1, ste0)
After the installation, I have an error "Network interface mismatch" and when I reasign the interfaces, re0   
disappeared. I try "ifconfig re0 up" but i have "interface does not exist". But this interface exist ! And with the live CD it works !