diff --git a/apps/virtualbng/src/main/java/org/onosproject/virtualbng/VbngService.java b/apps/virtualbng/src/main/java/org/onosproject/virtualbng/VbngService.java
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index 0000000..26e6e10
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+++ b/apps/virtualbng/src/main/java/org/onosproject/virtualbng/VbngService.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2015 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.onosproject.virtualbng;
+
+import org.onlab.packet.IpAddress;
+
+/**
+ * Provides service of the virtual BNG.
+ */
+public interface VbngService {
+
+    /**
+     * Creates a virtual BNG.
+     * <p>
+     * It firstly finds out an available local public IP address. Then, it
+     * sets up paths between the host configured with private IP and
+     * next hop. Finally it returns the public IP address.
+     * </p>
+     *
+     * @param privateIpAddress the private IP address
+     * @return the public address if a virtual BGN is successfully created,
+     *         otherwise return null
+     */
+    public IpAddress createVbng(IpAddress privateIpAddress);
+
+}