Fix network loop puzzles (add pingAgain test)

EduNetworkBuilder/NB.cs

@@ -40,7 +40,7 @@ namespace EduNetworkBuilder
     public enum NBSoundType { none, success, saved_ok, saved_failed }
     public enum RTFWindowContents { help, about, release_notes }
     public enum NetTestType { NeedsLocalIPTo, NeedsDefaultGW, NeedsLinkToDevice, NeedsRouteToNet, 
-        SuccessfullyPings, SuccessfullyArps, SuccessfullyDHCPs, HelpRequest, ReadContextHelp, FailedPing,
+        SuccessfullyPings, SuccessfullyPingsAgain, SuccessfullyArps, SuccessfullyDHCPs, HelpRequest, ReadContextHelp, FailedPing,
         DHCPServerEnabled,
         LockAll, LockIP, LockRoute, LockNic, LockDHCP, LockGateway
     }
@@ -304,6 +304,13 @@ namespace EduNetworkBuilder
             if (myWin.GameRandomGen == null) return null;
             return myWin.myNetwork;
         }
+        public static int nextPacketID()
+        {
+            BuilderWindow myWin = (BuilderWindow)Application.OpenForms["BuilderWindow"];
+            if (myWin == null) return 1;  //return something.
+            return myWin.nextPacketID();
+        }
+
         public static BuilderWindow GetBuilderWin()
         {
             BuilderWindow myWin = (BuilderWindow)Application.OpenForms["BuilderWindow"];