更新NTT类型为数字显示

1.FullCone
2.RestrictedCone
3.PortRestrictedCone
4.Symmetric

Netch/Forms/MainForm.Status.cs

@@ -124,11 +124,13 @@ namespace Netch.Forms
                 {
                     NatTypeStatusLabel.Text = String.Format("NAT{0}{1}", i18N.Translate(": "), text);
                 }
-
-                if (Enum.TryParse(text, false, out STUN_Client.NatType natType))
+                if (int.TryParse(text, out int natType))
                 {
-                    NatTypeStatusLightLabel.Visible = true;
-                    UpdateNatTypeLight(natType);
+                    if (natType > 0 && natType < 5)
+                    {
+                        NatTypeStatusLightLabel.Visible = true;
+                        UpdateNatTypeLight(natType);
+                    }
                 }
             }
             else
@@ -169,6 +171,35 @@ namespace Netch.Forms
             NatTypeStatusLightLabel.ForeColor = c;
         }
 
+        /// <summary>
+        ///     更新 NAT指示灯颜色
+        /// </summary>
+        /// <param name="natType"></param>
+        private void UpdateNatTypeLight(int natType)
+        {
+            Color c;
+            switch (natType)
+            {
+                case 1:
+                    c = Color.LimeGreen;
+                    break;
+                case 2:
+                    c = Color.Yellow;
+                    break;
+                case 3:
+                    c = Color.Red;
+                    break;
+                case 4:
+                    c = Color.Black;
+                    break;
+                default:
+                    c = Color.Black;
+                    break;
+            }
+
+            NatTypeStatusLightLabel.ForeColor = c;
+        }
+
         /// <summary>
         ///     更新状态栏文本
         /// </summary>

Netch/Models/Setting.cs

@@ -166,7 +166,7 @@ namespace Netch.Models
         /// <summary>
         ///     STUN测试服务器
         /// </summary>
-        public string STUN_Server = "stun.stunprotocol.org";
+        public string STUN_Server = "stun.syncthing.net";
 
         /// <summary>
         ///     STUN测试服务器