diff --git a/EduNetworkBuilder/NB.cs b/EduNetworkBuilder/NB.cs
index cedac84..0edf325 100644
--- a/EduNetworkBuilder/NB.cs
+++ b/EduNetworkBuilder/NB.cs
@@ -89,7 +89,8 @@ namespace EduNetworkBuilder
     public enum DebugPausePoint { none=0, packet_create=1, packet_kill=2, 
         packet_in=4, packet_out=8, packet_duplicate=16, all=63, 
         dump=256, pause=512}
-    
+    public enum TraersalTechnology { gateway, static_route, vlan, ethernet, wireless, firewall,
+        vpn, vpn_encryption, ip_address}
 
     [Serializable]
     public struct HostNicID //This holds a unique identifier for a network card.  Links use this to know what it is connected to