two network card issues on rawhide upgrade

I upgraded one of my router from F9 to rawhide (F10). Well I got a message stating that Mac address were wrong, I made a autodetect, then eth0 became eth1 and eth1 eth0 (i.e. eth0 was the internal network card and became the Internet card, the reverse for eth0) Of course I had to change eth0 in eth1 and viceversa also in iptables!!! What is the component to blame??? -- Antonio Montagnani Skype : antoniomontag