Add the commands that you used to start your network manually to the end of the /etc/rc.d/rc.local script. You must be root to edit this file. The commands in /etc/rc.d/rc.local are executed just before X is started.
When you do add the commands to the rc.local script, be sure to add the full path to each command. For example, if one of the commands that you need to use is modprobe to load some module, enter it like so:
This ensures that the commands will execute. ;-)
You can use the "which commandname" command (without quotes) in a terminal to find where the commands are. Do this as root so that all the commands you need can be found.