[CentOS] question on modprobe.conf

I download the RHEL 6b2 and noticed the modprobe.conf
was no longer present.

I used modprobe.conf to place "options" for ethernet drivers
like which order to install the drivers. e1000e before forcedeth - 
things like that.
Anyway - seems like that file is no longer present.

what is the "future" way to handle driver options?

Thanks

Jerry