Unity Script Reference – Network.HavePublicAddress

static function HavePublicAddress () : boolean

Description

Check if this machine has a public IP address.

It checks all the network interfaces for IPv4 public addresses and returns true if one address is found.

JavaScript

    function OnGUI() {
        if (GUILayout.Button ("Start Server")) {
            // Use NAT punchthrough if no public IP present
            var useNat = !Network.HavePublicAddress();
            Network.InitializeServer(32, 25002, useNat);
            MasterServer.RegisterHost("MyUniqueGameType", 
                "JohnDoes game", "l33t game for all");
        }
    }

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void OnGUI() {
        if (GUILayout.Button("Start Server")) {
            bool useNat = !Network.HavePublicAddress();
            Network.InitializeServer(32, 25002, useNat);
            MasterServer.RegisterHost("MyUniqueGameType", "JohnDoes game", "l33t game for all");
        }
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def OnGUI():
        if GUILayout.Button('Start Server'):
            useNat as bool = (not Network.HavePublicAddress())
            Network.InitializeServer(32, 25002, useNat)
            MasterServer.RegisterHost('MyUniqueGameType', 'JohnDoes game', 'l33t game for all')