Ok some news on this.
I create my client with something like this :
export var SERVERPORT = 8996
export var SERVERIP = "127.0.0.1"
var peer = NetworkedMultiplayerENet.new()
So it's connecting to my local server. To connect with my distant server I just change the SERVER_IP value :
export var SERVER_IP = "my.own.distant.server"
Well, it doesn't seems to work, my client is still triying to reach a local server, in my logs I found something like : inet_addr : "127.0.0.1"
Anyone knows why ? And how to point godot to the right adress ?