Define network interface on Gentoo Linux systems. See /etc/sysconfig/network-scripts/ifcfg-eth0 for RedHat systems and /etc/network/interfaces for Ubuntu.
config_eth0=( "dhcp" )
config_eth0=( "192.168.149.36/24" )
routes_eth0=( "default via 192.168.149.2" ) # IPv4 default route
ln -s net.lo /etc/init.d/net.<dev>