diff --git a/Program.cs b/Program.cs
index de05c32..715ceef 100644
--- a/Program.cs
+++ b/Program.cs
@@ -45,9 +45,6 @@ namespace ln.skyscanner
 
         public static void Main(string[] args)
         {
-            new testODB().TestCase();
-            return;
-
             FileLogger fileLogger = new FileLogger("skyscanner.log");
             fileLogger.MaxLogLevel = LogLevel.INFO;
             Logger.Default.Backends.Add(fileLogger);
@@ -63,6 +60,8 @@ namespace ln.skyscanner
 
         private static void Initialize()
         {
+            SNMPEngine.DefaultEngine.Timeout = 3500;
+
             //using (ODB odb = new ODB("odb"))
             //{
 
diff --git a/crawl/Crawler.cs b/crawl/Crawler.cs
index 74486b4..18f7284 100644
--- a/crawl/Crawler.cs
+++ b/crawl/Crawler.cs
@@ -213,6 +213,7 @@ namespace ln.skyscanner.crawl
             CrawledSubnet sn = CrawledSubnets.Where(subnet => subnet.Network.Equals(network)).FirstOrDefault();
             if (sn == null)
             {
+                Logging.Log(LogLevel.INFO, "Crawler adds new subnet: {0}",network);
                 sn = new CrawledSubnet(network);
                 CrawledSubnets.Insert(sn);
             }
diff --git a/entities/GlobalNetwork.cs b/entities/GlobalNetwork.cs
index 50d29f0..e9ca68f 100644
--- a/entities/GlobalNetwork.cs
+++ b/entities/GlobalNetwork.cs
@@ -90,9 +90,7 @@ namespace ln.skyscanner.entities
             ip = ip.Host;
 
             IntfIP _iip = SkyEntities.intfIPCollection.Where((iip) => iip.IP.Host.Equals(ip)).FirstOrDefault();
-            if (_iip != null)
-                return _iip.NetworkInterface.Node;
-            return null;
+            return _iip?.NetworkInterface?.Node;
         }
 
         [Unsynced]
diff --git a/entities/NetworkInterface.cs b/entities/NetworkInterface.cs
index 62e6b16..6b9c5c5 100644
--- a/entities/NetworkInterface.cs
+++ b/entities/NetworkInterface.cs
@@ -14,9 +14,10 @@ using ln.skyscanner.crawl;
 using ln.types.odb;
 using Newtonsoft.Json;
 using LiteDB;
+using ln.logging;
 namespace ln.skyscanner.entities
 {
-    public class NetworkInterface : Persistent
+    public class NetworkInterface
     {
         [DocumentID]
         public readonly Guid ID = Guid.NewGuid();
@@ -60,7 +61,11 @@ namespace ln.skyscanner.entities
 
         public override int GetHashCode()
         {
-            return Node.GetHashCode() ^ Name.GetHashCode();
+            if (Node == null)
+                Logging.Log(LogLevel.WARNING, "NetworkInterface without Node detected. ID={2} NodeID={0} Name={1}",NodeID,Name,ID);
+            else
+                return Node.GetHashCode() ^ Name.GetHashCode();
+            return 0;
         }
 
         public override bool Equals(object obj)
@@ -68,7 +73,7 @@ namespace ln.skyscanner.entities
             if (obj is NetworkInterface)
             {
                 NetworkInterface networkInterface = obj as NetworkInterface;
-                return Node.Equals(networkInterface.Node) && Name.Equals(networkInterface.Name);
+                return object.Equals(Node,networkInterface.Node) && object.Equals(Name,networkInterface.Name);
             }
             return false;
         }
diff --git a/entities/Node.cs b/entities/Node.cs
index 3a36c79..5714cc5 100644
--- a/entities/Node.cs
+++ b/entities/Node.cs
@@ -38,10 +38,8 @@ namespace ln.skyscanner.entities
 
         public string ProductLine { get; set; }
 
-        public IEnumerable<NetworkInterface> Interfaces => Timing.Meassure("Node.Interfaces",
-                () => SkyScanner.Instance.Entities.interfaceCollection.Select("NodeID", ID)
-            );
-        public IEnumerable<CIDR> IPAdresses => Timing.Meassure("Node.IPAddesses", () => Interfaces.SelectMany(intf => intf.IPs).Select((iip)=>iip.IP));
+        public IEnumerable<NetworkInterface> Interfaces => SkyScanner.Instance.Entities.interfaceCollection.Select("NodeID", ID);
+        public IEnumerable<CIDR> IPAdresses => Interfaces.SelectMany(intf => intf.IPs).Select((iip) => iip.IP).Distinct();
 
         private HashSet<URI> uris = new HashSet<URI>();
 
diff --git a/http/NetworkApi.cs b/http/NetworkApi.cs
index 051a996..03d9bc4 100644
--- a/http/NetworkApi.cs
+++ b/http/NetworkApi.cs
@@ -27,7 +27,8 @@ namespace ln.skyscanner.http
         [Callable]
         public Node[] GetNodes()
         {
-            return GlobalNetwork.Nodes.ToArray();
+            Node[] nodes = GlobalNetwork.Nodes.ToArray();
+            return nodes;
         }
 
         [Callable]
diff --git a/templates/static/nav.html b/templates/static/nav.html
index 9c0d239..d674296 100644
--- a/templates/static/nav.html
+++ b/templates/static/nav.html
@@ -20,7 +20,7 @@
     <div>
         <h1>Struktur</h1>
         <div>
-            <a href="/static/network" onclick="skyapi().loadPage('static/network/index.html'); return false;"><div>Übersicht</div></a>
+            <a href="/static/network/index.html" onclick="skyapi().loadPage('static/network/index.html'); return false;"><div>Übersicht</div></a>
         </div>
         <div>
             <a href="/static/network/hoptable.html" onclick="skyapi().loadPage('static/network/hoptable.html'); return false;"><div>Hop Table</div></a>
diff --git a/templates/static/network/index.html b/templates/static/network/index.html
index 9475247..98efb31 100644
--- a/templates/static/network/index.html
+++ b/templates/static/network/index.html
@@ -66,7 +66,7 @@
             $.each( node.Interfaces, function(){
                 var intf = this;
                 $.each( intf.IPs, function(){
-                    $("#dInterfaces").append( $( "<option value='"+ this +"'>" + this + "[ " + intf.Name + " ]</option>" ) );
+                    $("#dInterfaces").append( $( "<option value='"+ this.IP +"'>" + this.IP + "[ " + intf.Name + " ]</option>" ) );
                 });
             });