static_ip.steps

//static ip configuration on Slackware
//turn down interface
# ip link set eth0 down

//flush old ip
# ip addr flush dev eth0 up

//add static ip
# ip addr add {ip}/{mask} dev eth0 broadcast +

//turn on interface
# ip link set eth0 up

//add gateway
# ip route add default via {gateway}

//after this you can perform a ping to check connection