diff --git a/src/main/java/org/opencord/dhcpl2relay/DhcpL2Relay.java b/src/main/java/org/opencord/dhcpl2relay/DhcpL2Relay.java
index 29965dd..f941afc 100755
--- a/src/main/java/org/opencord/dhcpl2relay/DhcpL2Relay.java
+++ b/src/main/java/org/opencord/dhcpl2relay/DhcpL2Relay.java
@@ -156,6 +156,7 @@
     private ApplicationId appId;
 
     static Map<String, DhcpAllocationInfo> allocationMap = Maps.newConcurrentMap();
+    private boolean modifyClientPktsSrcDstMac = false;
 
     @Activate
     protected void activate(ComponentContext context) {
@@ -257,6 +258,7 @@
         }
 
         dhcpConnectPoints = Sets.newConcurrentHashSet(cfg.getDhcpServerConnectPoint());
+        modifyClientPktsSrcDstMac = cfg.getModifySrcDstMacAddresses();
 
         selectServerConnectPoint();
 
@@ -546,8 +548,10 @@
 
             ipv4Packet.setPayload(udpPacket);
             etherReply.setPayload(ipv4Packet);
-            etherReply.setSourceMacAddress(relayAgentMac);
-            etherReply.setDestinationMacAddress(dhcpConnectMac);
+            if (modifyClientPktsSrcDstMac) {
+                etherReply.setSourceMacAddress(relayAgentMac);
+                etherReply.setDestinationMacAddress(dhcpConnectMac);
+            }
 
             etherReply.setPriorityCode(ethernetPacket.getPriorityCode());
             etherReply.setVlanID(cTag(context).toShort());
diff --git a/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayConfig.java b/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayConfig.java
index eb60c7f..b3e3cf4 100755
--- a/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayConfig.java
+++ b/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayConfig.java
@@ -34,11 +34,31 @@
 public class DhcpL2RelayConfig extends Config<ApplicationId> {
 
     private static final String DHCP_CONNECT_POINTS = "dhcpServerConnectPoints";
+    private static final String MODIFY_SRC_DST_MAC  = "modifyUlPacketsSrcDstMacAddresses";
+
+    private static final Boolean DEFAULT_MODIFY_SRC_DST_MAC = false;
 
     @Override
     public boolean isValid() {
 
-        return hasOnlyFields(DHCP_CONNECT_POINTS);
+        return hasOnlyFields(DHCP_CONNECT_POINTS, MODIFY_SRC_DST_MAC);
+    }
+
+    /**
+     * Returns whether the app would modify MAC address of uplink packets.
+     *
+     * @return whether app would modify src and dst MAC addresses or not of packets
+     *         sent to the DHCP server
+     */
+    public boolean getModifySrcDstMacAddresses() {
+        if (object == null) {
+            return DEFAULT_MODIFY_SRC_DST_MAC;
+        }
+        if (!object.has(MODIFY_SRC_DST_MAC)) {
+            return DEFAULT_MODIFY_SRC_DST_MAC;
+        }
+
+        return object.path(MODIFY_SRC_DST_MAC).asBoolean();
     }
 
     /**
diff --git a/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java b/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java
index e6f97a8..691f8f1 100755
--- a/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java
+++ b/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java
@@ -381,6 +381,11 @@
         public Set<ConnectPoint> getDhcpServerConnectPoint() {
             return ImmutableSet.of(SERVER_CONNECT_POINT);
         }
+
+        @Override
+        public boolean getModifySrcDstMacAddresses() {
+            return true;
+        }
     }
 
     /**