on the version of fedora you are on, "ip addr" should show your interfaces and this, I think, would be the only way to bring up an interface with NetworkManager down (and actually, in this day and age you should probably use " ip address add <address> dev <interface name>" instead of ifconfig (so something like "ip address add 192.168.230.10/24 dev eth0") and then to set the route "ip route add 0.0.0.0 dev eth0 via <router address>" (so something like "ip route add 0.0.0.0 dev eth0 via 192.158.238.1" ).