Host and connect online by external IP

 function OnGUI()
 {
     if(Network.peerType == NetworkPeerType.Disconnected)
     {
         if(GUILayout.Button("Host"))
             Network.InitializeServer(32,25000,false); // This port is opened
         if(GUILayout.Button("Connect"))
             Network.Connect("xxx.xx.x.xx", 25000); // External IP from ex. http://www.whatsmyip.org/
     }
 }

(everything I've tried works perfectly on a local network, and by using ex. Hamachi, but not online by itself)

The code above is an example of what I want to do.

The external IP is the same for every computer connected to the same router, and I'm thinking that I'd need to specify my computers Local IP: 192.168.1.37 so that a client can connect client => router => my computer.

I've opened the ports and tried using the Master Server that Unity is hosting at 67.225.180.24:23466 but it fails to connect (possibly because it's down), I also tried hosting my own master server, but I only end up getting "Failed to connect to master server at ..."

I think I read somewhere that the host of a master server has to be connected directly to the internet, is this true?

1# Is my master server not working because I'm connected through a router?

2# Should I try to connect straight to the internet without a router?

3# Is there is a way to connect to a Unity server over the internet without using a master server/facilitator?

4# Is there a way to route a client to a specific computer that is connected through a router?