diff --git a/core/api/src/main/java/org/onlab/onos/net/NetworkResource.java b/core/api/src/main/java/org/onlab/onos/net/NetworkResource.java
index 65bb4e8..faf3241 100644
--- a/core/api/src/main/java/org/onlab/onos/net/NetworkResource.java
+++ b/core/api/src/main/java/org/onlab/onos/net/NetworkResource.java
@@ -16,7 +16,7 @@
 package org.onlab.onos.net;
 
 /**
- * Representation of a network resource.
+ * Representation of a network resource, e.g. a link, lambda, MPLS tag.
  */
 public interface NetworkResource {
 }
diff --git a/core/api/src/main/java/org/onlab/onos/net/Tunnel.java b/core/api/src/main/java/org/onlab/onos/net/Tunnel.java
new file mode 100644
index 0000000..d5fad6c
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/Tunnel.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2014 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onlab.onos.net;
+
+/**
+ * Abstraction of a generalized network tunnel.
+ */
+public interface Tunnel extends Link {
+
+    /**
+     * Tunnel technology type.
+     */
+    enum Type {
+        MPLS, VLAN, VXLAN, GRE, OPTICAL
+    }
+
+    /**
+     * Network resource backing the tunnel, e.g. lambda, VLAN id, MPLS tag.
+     *
+     * @return backing resource
+     */
+    NetworkResource resource();
+
+}
diff --git a/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java b/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java
index b70e461..4237829 100644
--- a/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java
+++ b/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java
@@ -15,14 +15,13 @@
  */
 package org.onlab.packet;
 
-import java.net.InetAddress;
-
 import com.google.common.net.InetAddresses;
 import com.google.common.testing.EqualsTester;
 import org.junit.Test;
 
+import java.net.InetAddress;
+
 import static org.hamcrest.Matchers.is;
-import static org.hamcrest.Matchers.not;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;