broadcast address only applies to correct subnet

Ultimately, the problem stemmed from a ping to an address
       with the wrong subnet mask (auto-filled subnet) which turned
       the address (which should have been routed) into a local broadcast.
       Only the global broadcast, or a local broadcast should be accepted,
       not a broadcast that should be routed.

       This can be seen in Level 4, Small Subnets puzzle.
       1.) fix router2 to be /31
       2.) from pc1, ping pc2 (which turns into 192.168.1.3)
                       -autoIP filled in a subnet mask of 255.255.255.252
                       -therefore 1.3 is considered the broadcast IP.
       -result: a local broadcast on the 192.168.2 network.
       3.) from pc1, ping 192.168.1.1 or 192.168.1.4 works fine.
       4.) edit firewall1, edit route to 192.168.1.1
                       -make no changes, just hit OK
       5.) again from pc1 ping pc2
                       -now autoIP fills in subnet mask 255.255.255.0
       -result: it works

EduNetworkBuilder/NetworkDevice.cs

@@ -1431,7 +1431,12 @@ namespace EduNetworkBuilder
         public bool HasBroadcastAddress(NB_IPAddress dest)
         {
             if (dest.BroadcastAddress == dest.GetIP) return true;
-            foreach(NetworkCard nic in NICs)
+
+            //This "fixes" a strange fringe case of when we configure a subnet such that
+            //a packet that is traversing the network suddenly is a broadcast packet on the
+            //target network.  Gotta have odd subnetting for this to happen
+            if (NB.BroadcastIPString == dest.GetIPString) return true;
+            foreach (NetworkCard nic in NICs)
             {
                 if (nic.HasBroadcastAddresses(dest))
                     return true;