Ok, I've seen that guide.
Here is my /etc/conf.d/modules file:
# You can define a list modules for a specific kernel version,
# a released kernel version, a main kernel version or just a list.
#modules_2_6_23_gentoo_r5="ieee1394 ohci1394"
#modules_2_6_23="tun ieee1394"
#modules_2_6="tun"
#modules="ohci1394"
# Give the modules some arguments if needed, per version if necessary.
#module_ieee1394_args="debug"
#module_ieee1394_args_2_6_23_gentoo_r5="ieee1394 ohci1394"
#module_ieee1394_args_2_6_23="tun ieee1394"
#module_ieee1394_args_2_6="tun"
# You should consult your kernel documentation and configuration
# for a list of modules and their options.
# Load raw1394 for dv camera operations
modules="raw1394"
# Load vboxdrv for VirtualBox virtual machines
modules="vboxdrv"
# Load tun for OpenVPN tun/tap support
modules="tun"
But doesn't work ..
What's the next step?
Mauro