Someone

# MY NORMAL CONFIG

config_eth0=( "10.0.0.2 netmask 255.255.255.0 brd 10.0.0.255" )
routes_eth0=( "default gw 10.0.0.1" )

# THE GENTOO WIKI ABOUT BRIDING
config_eth0=( "null" )
tuntap_vbox0="tap"
config_vbox0=( "null")
config_br0=( "10.0.0.2 netmask 255.255.255.0" )
routes_br0=( "default via 10.0.0.1" )
bridge_br0="eth0 vbox0"
depend_br0() {
        need net.eth0 net.vbox0
}
brctl_br0=( "setfd 0")