I have two interfaces, wlp5s4 and enp0s29f7u5. I would like to only use enp0s29f7u5 for 192.168.8.1, but for any other traffic I would like to use wlp5s4 as enp0s29f7u5 isn't actually connected to the outside world. 
One Ip through an interface and all others through another
iptables