added -ip so you are able to specify which ip to bind the server

Barotrauma/BarotraumaServer/ServerSource/GameMain.cs

@@ -12,6 +12,7 @@ using System.Reflection;
 using System.Threading;
 using System.Xml.Linq;
 using MoonSharp.Interpreter;
+using System.Net;
 
 namespace Barotrauma
 {
@@ -221,6 +222,7 @@ namespace Barotrauma
             int maxPlayers = 10;
             int? ownerKey = null;
             UInt64 steamId = 0;
+            IPAddress listenIp = IPAddress.Any;
 
             XDocument doc = XMLExtensions.TryLoadXml(ServerSettings.SettingsFile);
             if (doc?.Root == null)
@@ -254,6 +256,12 @@ namespace Barotrauma
                         name = CommandLineArgs[i + 1];
                         i++;
                         break;
+                    case "-ip":
+                        if (IPAddress.TryParse(CommandLineArgs[i + 1], out IPAddress address))
+                            listenIp = address;
+                        else
+                            DebugConsole.ThrowError($"Invalid Ip Address '{CommandLineArgs[i + 1]}'.");
+                        break;
                     case "-port":
                         int.TryParse(CommandLineArgs[i + 1], out port);
                         i++;
@@ -302,6 +310,7 @@ namespace Barotrauma
 
             Server = new GameServer(
                 name,
+                listenIp,
                 port,
                 queryPort,
                 publiclyVisible,

Barotrauma/BarotraumaServer/ServerSource/Networking/GameServer.cs

@@ -12,6 +12,7 @@ using System.Linq;
 using System.Threading;
 using System.Xml.Linq;
 using MoonSharp.Interpreter;
+using System.Net;
 
 namespace Barotrauma.Networking
 {
@@ -114,7 +115,7 @@ namespace Barotrauma.Networking
         private readonly int? ownerKey;
         private readonly UInt64? ownerSteamId;
 
-        public GameServer(string name, int port, int queryPort = 0, bool isPublic = false, string password = "", bool attemptUPnP = false, int maxPlayers = 10, int? ownKey = null, UInt64? steamId = null)
+        public GameServer(string name, IPAddress listenIp, int port, int queryPort = 0, bool isPublic = false, string password = "", bool attemptUPnP = false, int maxPlayers = 10, int? ownKey = null, UInt64? steamId = null)
         {
             name = name.Replace(":", "");
             name = name.Replace(";", "");
@@ -127,7 +128,7 @@ namespace Barotrauma.Networking
 
             LastClientListUpdateID = 0;
 
-            serverSettings = new ServerSettings(this, name, port, queryPort, maxPlayers, isPublic, attemptUPnP);
+            serverSettings = new ServerSettings(this, name, port, queryPort, maxPlayers, isPublic, attemptUPnP, listenIp);
             KarmaManager.SelectPreset(serverSettings.KarmaPreset);
             serverSettings.SetPassword(password);
 

Barotrauma/BarotraumaServer/ServerSource/Networking/Primitives/Peers/Server/LidgrenServerPeer.cs

@@ -37,7 +37,8 @@ namespace Barotrauma.Networking
                 AutoExpandMTU = false,
                 MaximumConnections = NetConfig.MaxPlayers * 2,
                 EnableUPnP = serverSettings.EnableUPnP,
-                Port = serverSettings.Port
+                Port = serverSettings.Port,
+                LocalAddress = serverSettings.ListenIPAddress
             };
 
             netPeerConfiguration.DisableMessageType(NetIncomingMessageType.DebugMessage |

Barotrauma/BarotraumaServer/ServerSource/Networking/SteamManager.cs

@@ -16,7 +16,8 @@ namespace Barotrauma.Steam
             {
                 GamePort = (ushort)server.Port,
                 QueryPort = isPublic ? (ushort)server.QueryPort : (ushort)0,
-                Mode = isPublic ? Steamworks.InitServerMode.Authentication : Steamworks.InitServerMode.NoAuthentication
+                Mode = isPublic ? Steamworks.InitServerMode.Authentication : Steamworks.InitServerMode.NoAuthentication,
+                IpAddress = server.ServerSettings.ListenIPAddress
             };
             //options.QueryShareGamePort();