diff --git a/EduNetworkBuilder/NetworkCard.cs b/EduNetworkBuilder/NetworkCard.cs
index a50c60c..30554fc 100644
--- a/EduNetworkBuilder/NetworkCard.cs
+++ b/EduNetworkBuilder/NetworkCard.cs
@@ -103,6 +103,9 @@ namespace EduNetworkBuilder
             if (MAC != compareWith.MAC) return false;
 
             //List<NetworkInterface> interfaces = new List<NetworkInterface>();
+            if (interfaces.Count != compareWith.interfaces.Count) return false;
+            for (int i = 0; i < interfaces.Count; i++)
+                if (!interfaces[i].Equals(compareWith.interfaces[i])) return false;
             if (UsesDHCP != compareWith.UsesDHCP) return false;
             if (CanUseDHCP != compareWith.CanUseDHCP) return false;
             if (MustUseDHCP != compareWith.MustUseDHCP) return false;
diff --git a/EduNetworkBuilder/NetworkInterface.cs b/EduNetworkBuilder/NetworkInterface.cs
index 140fa72..3136e7e 100644
--- a/EduNetworkBuilder/NetworkInterface.cs
+++ b/EduNetworkBuilder/NetworkInterface.cs
@@ -66,6 +66,17 @@ namespace EduNetworkBuilder
             return null;
         }
 
+        public bool Equals(NetworkInterface CompareWith)
+        {
+            if (!myIP.Equals(CompareWith.myIP)) return false;
+            if (nic_name != CompareWith.nic_name) return false;
+            if (!AttachedToHostNic.Equals(CompareWith.AttachedToHostNic)) return false;
+            if (VLANs.Count != CompareWith.VLANs.Count) return false;
+            for (int i = 0; i < VLANs.Count; i++)
+                if (!VLANs[i].Equals(CompareWith.VLANs[i])) return false;
+            return true;
+        }
+
         public VLANTagType GetVLANTag(int id)
         {
             VLANInfo vli = GetVLANInfo(id);