diff --git a/tests/flow_stats.py b/tests/flow_stats.py
index 7ebab4b..473bda2 100644
--- a/tests/flow_stats.py
+++ b/tests/flow_stats.py
@@ -28,6 +28,20 @@
 #@var pa_config Local copy of global configuration data
 pa_config = None
 
+# TODO: ovs has problems with VLAN id?
+WILDCARD_VALUES = [ofp.OFPFW_IN_PORT,
+                   # ofp.OFPFW_DL_VLAN,
+                   ofp.OFPFW_DL_SRC,
+                   ofp.OFPFW_DL_DST,
+                   ofp.OFPFW_DL_TYPE,
+                   ofp.OFPFW_NW_PROTO,
+                   ofp.OFPFW_TP_SRC,
+                   ofp.OFPFW_TP_DST,
+                   0x3F << ofp.OFPFW_NW_SRC_SHIFT,
+                   0x3F << ofp.OFPFW_NW_DST_SHIFT,
+                   ofp.OFPFW_DL_VLAN_PCP,
+                   ofp.OFPFW_NW_TOS]
+
 def test_set_init(config):
     """
     Set up function for packet action test classes
@@ -35,8 +49,6 @@
     @param config The configuration dictionary; see oft
     """
 
-    basic.test_set_init(config)
-
     global pa_port_map
     global pa_logger
     global pa_config
@@ -46,17 +58,56 @@
     pa_port_map = config["port_map"]
     pa_config = config
 
-class FlowStats(basic.SimpleDataPlane):
+class SingleFlowStats(basic.SimpleDataPlane):
     """
     Verify flow stats are properly retrieved.
 
     Generate a packet
-    Generate and install a matching flow with idle timeout = 1 sec
-    Verify the flow expiration message is received
+    Generate and install a matching flow
+    Send the packet
+    Send a flow stats request to match the flow and retrieve stats
+    Verify that the packet counter has incremented
     """
+
+    def verifyStats(self, match, out_port, test_timeout, packet_count):
+        stat_req = message.flow_stats_request()
+        stat_req.match = match
+        stat_req.table_id = 0xff
+        stat_req.out_port = out_port
+
+        all_packets_received = 0
+        for i in range(0,test_timeout):
+            pa_logger.info("Sending stats request")
+            rv = self.controller.message_send(stat_req)
+            self.assertTrue(rv != -1, "Error sending flow stat req")
+            do_barrier(self.controller)
+
+            (response, raw) = self.controller.poll(ofp.OFPT_STATS_REPLY, 2)
+            self.assertTrue(len(response.stats) == 1, "Did not receive flow stats reply")
+            for obj in response.stats:
+                # TODO: pad1 and pad2 fields may be nonzero, is this a bug?
+                # for now, just clear them so the assert is simpler
+                #obj.match.pad1 = 0
+                #obj.match.pad2 = [0, 0]
+                #self.assertEqual(match, obj.match,
+                #                 "Matches do not match")
+                pa_logger.info("Received " + str(obj.packet_count) + " packets")
+                if obj.packet_count == packet_count:
+                    all_packets_received = 1
+
+            if all_packets_received:
+                break
+            sleep(1)
+
+        self.assertTrue(all_packets_received,
+                        "Packet count does not match number sent")
+
     def runTest(self):
         global pa_port_map
 
+        # TODO: set from command-line parameter
+        test_timeout = 60
+
         of_ports = pa_port_map.keys()
         of_ports.sort()
         self.assertTrue(len(of_ports) > 1, "Not enough ports for test")
@@ -64,6 +115,7 @@
         rc = delete_all_flows(self.controller, pa_logger)
         self.assertEqual(rc, 0, "Failed to delete all flows")
 
+        # build packet
         pkt = simple_tcp_packet()
         match = parse.packet_to_flow_match(pkt)
         match.wildcards &= ~ofp.OFPFW_IN_PORT
@@ -71,55 +123,318 @@
                         "Could not generate flow match from pkt")
         act = action.action_output()
 
+        # build flow
         ingress_port = of_ports[0];
         egress_port = of_ports[1];
         pa_logger.info("Ingress " + str(ingress_port) + 
                        " to egress " + str(egress_port))
-        
+        match.in_port = ingress_port
+        flow_mod_msg = message.flow_mod()
+        flow_mod_msg.match = match
+        flow_mod_msg.cookie = random.randint(0,9007199254740992)
+        flow_mod_msg.buffer_id = 0xffffffff
+        flow_mod_msg.idle_timeout = 0
+        flow_mod_msg.hard_timeout = 0
+        act.port = egress_port
+        self.assertTrue(flow_mod_msg.actions.add(act), "Could not add action")
+       
+        # send flow
+        pa_logger.info("Inserting flow")
+        rv = self.controller.message_send(flow_mod_msg)
+        self.assertTrue(rv != -1, "Error installing flow mod")
+        do_barrier(self.controller)
+
+        # no packets sent, so zero packet count
+        self.verifyStats(match, ofp.OFPP_NONE, test_timeout, 0)
+
+        # send packet N times
+        num_sends = random.randint(10,20)
+        pa_logger.info("Sending " + str(num_sends) + " test packets")
+        for i in range(0,num_sends):
+            pa_logger.info("Sending packet to dp port " + 
+                           str(ingress_port))
+            self.dataplane.send(ingress_port, str(pkt))
+            (rcv_port, rcv_pkt, pkt_time) = self.dataplane.poll(timeout=test_timeout)
+            self.assertTrue(rcv_pkt is not None, "Did not receive packet")
+            pa_logger.debug("Packet len " + str(len(pkt)) + " in on " + 
+                            str(rcv_port))
+            self.assertEqual(rcv_port, egress_port, "Unexpected receive port")
+            for j in range(0,test_timeout):
+                if str(pkt) == str(rcv_pkt):
+                    break
+                sleep(1)
+            self.assertTrue(j < test_timeout,
+                            'Timeout sending packets for flow stats test')
+
+        self.verifyStats(match, ofp.OFPP_NONE, test_timeout, num_sends)
+        self.verifyStats(match, egress_port, test_timeout, num_sends)
+        for wc in WILDCARD_VALUES:
+            match.wildcards = wc
+            self.verifyStats(match, egress_port, test_timeout, num_sends)
+
+
+class TwoFlowStats(basic.SimpleDataPlane):
+    """
+    Verify flow stats are properly retrieved.
+
+    Generate two packets and install two matching flows
+    Send some number of packets
+    Send a flow stats request to match the flows and retrieve stats
+    Verify that the packet counter has incremented
+
+    TODO: add a third flow, and then configure the match to exclude
+    that flow?
+    """
+
+    def buildFlowModMsg(self, pkt, ingress_port, egress_port):
+        match = parse.packet_to_flow_match(pkt)
+        match.wildcards &= ~ofp.OFPFW_IN_PORT
+        self.assertTrue(match is not None, 
+                        "Could not generate flow match from pkt")
         match.in_port = ingress_port
         
         flow_mod_msg = message.flow_mod()
         flow_mod_msg.match = match
         flow_mod_msg.cookie = random.randint(0,9007199254740992)
         flow_mod_msg.buffer_id = 0xffffffff
-        flow_mod_msg.idle_timeout = 1
+        flow_mod_msg.idle_timeout = 0
+        flow_mod_msg.hard_timeout = 0
+        act = action.action_output()
         act.port = egress_port
         self.assertTrue(flow_mod_msg.actions.add(act), "Could not add action")
-        
-        stat_req = message.flow_stats_request()
-        stat_req.match = match
-        stat_req.table_id = 0xff
-        stat_req.out_port = ofp.OFPP_NONE;
 
-        do_barrier(self.controller)
-        pa_logger.info("Sending stats request")
-        rv = self.controller.message_send(stat_req)
-        self.assertTrue(rv != -1, "Error sending flow stat req")
-        do_barrier(self.controller)
+        pa_logger.info("Ingress " + str(ingress_port) + 
+                       " to egress " + str(egress_port))
 
-        (response, raw) = self.controller.poll(ofp.OFPT_STATS_REPLY, 2)
-        
-        pa_logger.info("Inserting flow")
-        rv = self.controller.message_send(flow_mod_msg)
-        self.assertTrue(rv != -1, "Error installing flow mod")
-        do_barrier(self.controller)
+        return flow_mod_msg
 
+    def sendPacket(self, pkt, ingress_port, egress_port, test_timeout):
         pa_logger.info("Sending packet to dp port " + 
                        str(ingress_port))
         self.dataplane.send(ingress_port, str(pkt))
-        (rcv_port, rcv_pkt, pkt_time) = self.dataplane.poll(timeout=2)
+        (rcv_port, rcv_pkt, pkt_time) = self.dataplane.poll(timeout=test_timeout)
         self.assertTrue(rcv_pkt is not None, "Did not receive packet")
         pa_logger.debug("Packet len " + str(len(pkt)) + " in on " + 
                         str(rcv_port))
         self.assertEqual(rcv_port, egress_port, "Unexpected receive port")
-        self.assertEqual(str(pkt), str(rcv_pkt),
-                         'Response packet does not match send packet')
-            
-        pa_logger.info("Sending stats request")
-        rv = self.controller.message_send(stat_req)
-        self.assertTrue(rv != -1, "Error sending flow stat req")
+        for j in range(0,test_timeout):
+            if str(pkt) == str(rcv_pkt):
+                break
+            sleep(1)
+        self.assertTrue(j < test_timeout,
+                        'Timeout sending packets for flow stats test')
+
+    def verifyStats(self, match, out_port, test_timeout, packet_count):
+        stat_req = message.flow_stats_request()
+        stat_req.match = match
+        stat_req.table_id = 0xff
+        stat_req.out_port = out_port
+
+        all_packets_received = 0
+        for i in range(0,test_timeout):
+            pa_logger.info("Sending stats request")
+            rv = self.controller.message_send(stat_req)
+            self.assertTrue(rv != -1, "Error sending flow stat req")
+            do_barrier(self.controller)
+
+            (response, raw) = self.controller.poll(ofp.OFPT_STATS_REPLY, 2)
+            self.assertTrue(len(response.stats) >= 1, "Did not receive flow stats reply")
+            total_packets = 0
+            for obj in response.stats:
+                # TODO: pad1 and pad2 fields may be nonzero, is this a bug?
+                # for now, just clear them so the assert is simpler
+                #obj.match.pad1 = 0
+                #obj.match.pad2 = [0, 0]
+                #self.assertEqual(match, obj.match,
+                #                 "Matches do not match")
+                pa_logger.info("Received " + str(obj.packet_count) + " packets")
+                total_packets += obj.packet_count
+            if total_packets == packet_count:
+                all_packets_received = 1
+                break
+            sleep(1)
+
+        self.assertTrue(all_packets_received,
+                        "Packet count does not match number sent")
+
+    def runTest(self):
+        global pa_port_map
+
+        # TODO: set from command-line parameter
+        test_timeout = 60
+
+        of_ports = pa_port_map.keys()
+        of_ports.sort()
+        self.assertTrue(len(of_ports) >= 3, "Not enough ports for test")
+        ingress_port = of_ports[0];
+        egress_port1 = of_ports[1];
+        egress_port2 = of_ports[2];
+
+        rc = delete_all_flows(self.controller, pa_logger)
+        self.assertEqual(rc, 0, "Failed to delete all flows")
+
+        pkt1 = simple_tcp_packet()
+        flow_mod_msg1 = self.buildFlowModMsg(pkt1, ingress_port, egress_port1)
+       
+        pkt2 = simple_tcp_packet(dl_src='0:7:7:7:7:7')
+        flow_mod_msg2 = self.buildFlowModMsg(pkt2, ingress_port, egress_port2)
+       
+        pa_logger.info("Inserting flow1")
+        rv = self.controller.message_send(flow_mod_msg1)
+        self.assertTrue(rv != -1, "Error installing flow mod")
+        pa_logger.info("Inserting flow2")
+        rv = self.controller.message_send(flow_mod_msg2)
+        self.assertTrue(rv != -1, "Error installing flow mod")
         do_barrier(self.controller)
 
-        (response, raw) = self.controller.poll(ofp.OFPT_STATS_REPLY, 2)
-        #print "YYY: Stats reply is \n%s" % (response.show())
-        self.assertTrue(len(response.stats) == 1, "Did not receive flow stats reply")
+        num_pkt1s = random.randint(10,30)
+        pa_logger.info("Sending " + str(num_pkt1s) + " pkt1s")
+        num_pkt2s = random.randint(10,30)
+        pa_logger.info("Sending " + str(num_pkt2s) + " pkt2s")
+        for i in range(0,num_pkt1s):
+            self.sendPacket(pkt1, ingress_port, egress_port1, test_timeout)
+        for i in range(0,num_pkt2s):
+            self.sendPacket(pkt2, ingress_port, egress_port2, test_timeout)
+            
+        match1 = parse.packet_to_flow_match(pkt1)
+        self.verifyStats(match1, ofp.OFPP_NONE, test_timeout, num_pkt1s)
+        match2 = parse.packet_to_flow_match(pkt2)
+        self.verifyStats(match2, ofp.OFPP_NONE, test_timeout, num_pkt2s)
+        match1.wildcards |= ofp.OFPFW_DL_SRC
+        self.verifyStats(match1, ofp.OFPP_NONE, test_timeout, 
+                         num_pkt1s+num_pkt2s)
+        # TODO: sweep through the wildcards to verify matching?
+
+
+class AggregateStats(basic.SimpleDataPlane):
+    """
+    Verify aggregate flow stats are properly retrieved.
+
+    Generate two packets
+    Generate and install two matching flows
+    Send an aggregate stats request
+    Verify that aggregate stats are correct
+    Also verify out_port filtering
+    """
+
+    def buildFlowModMsg(self, pkt, ingress_port, egress_port):
+        match = parse.packet_to_flow_match(pkt)
+        match.wildcards &= ~ofp.OFPFW_IN_PORT
+        self.assertTrue(match is not None, 
+                        "Could not generate flow match from pkt")
+        match.in_port = ingress_port
+        
+        flow_mod_msg = message.flow_mod()
+        flow_mod_msg.match = match
+        flow_mod_msg.cookie = random.randint(0,9007199254740992)
+        flow_mod_msg.buffer_id = 0xffffffff
+        flow_mod_msg.idle_timeout = 0
+        flow_mod_msg.hard_timeout = 0
+        act = action.action_output()
+        act.port = egress_port
+        self.assertTrue(flow_mod_msg.actions.add(act), "Could not add action")
+
+        pa_logger.info("Ingress " + str(ingress_port) + 
+                       " to egress " + str(egress_port))
+
+        return flow_mod_msg
+
+    def sendPacket(self, pkt, ingress_port, egress_port, test_timeout):
+        pa_logger.info("Sending packet to dp port " + 
+                       str(ingress_port))
+        self.dataplane.send(ingress_port, str(pkt))
+        (rcv_port, rcv_pkt, pkt_time) = self.dataplane.poll(timeout=test_timeout)
+        self.assertTrue(rcv_pkt is not None, "Did not receive packet")
+        pa_logger.debug("Packet len " + str(len(pkt)) + " in on " + 
+                        str(rcv_port))
+        self.assertEqual(rcv_port, egress_port, "Unexpected receive port")
+        for j in range(0,test_timeout):
+            if str(pkt) == str(rcv_pkt):
+                break
+            sleep(1)
+        self.assertTrue(j < test_timeout,
+                        'Timeout sending packets for flow stats test')
+
+    def verifyAggFlowStats(self, match, out_port, test_timeout, 
+                           flow_count, packet_count):
+        stat_req = message.aggregate_stats_request()
+        stat_req.match = match
+        stat_req.table_id = 0xff
+        stat_req.out_port = out_port
+
+        all_packets_received = 0
+        for i in range(0,test_timeout):
+            pa_logger.info("Sending stats request")
+            rv = self.controller.message_send(stat_req)
+            self.assertTrue(rv != -1, "Error sending flow stat req")
+            do_barrier(self.controller)
+
+            (response, raw) = self.controller.poll(ofp.OFPT_STATS_REPLY, 2)
+            self.assertTrue(len(response.stats) == 1, "Did not receive flow stats reply")
+            for obj in response.stats:
+                self.assertTrue(obj.flow_count == flow_count,
+                                "Flow count " + str(obj.flow_count) +
+                                " does not match expected " + str(flow_count))
+                pa_logger.info("Received " + str(obj.packet_count) + " packets")
+                if obj.packet_count == packet_count:
+                    all_packets_received = 1
+
+            if all_packets_received:
+                break
+            sleep(1)
+
+        self.assertTrue(all_packets_received,
+                        "Packet count does not match number sent")
+
+    def runTest(self):
+        global pa_port_map
+
+        # TODO: set from command-line parameter
+        test_timeout = 60
+
+        of_ports = pa_port_map.keys()
+        of_ports.sort()
+        self.assertTrue(len(of_ports) >= 3, "Not enough ports for test")
+        ingress_port = of_ports[0];
+        egress_port1 = of_ports[1];
+        egress_port2 = of_ports[2];
+
+        rc = delete_all_flows(self.controller, pa_logger)
+        self.assertEqual(rc, 0, "Failed to delete all flows")
+
+        pkt1 = simple_tcp_packet()
+        flow_mod_msg1 = self.buildFlowModMsg(pkt1, ingress_port, egress_port1)
+       
+        pkt2 = simple_tcp_packet(dl_src='0:7:7:7:7:7')
+        flow_mod_msg2 = self.buildFlowModMsg(pkt2, ingress_port, egress_port2)
+       
+        pa_logger.info("Inserting flow1")
+        rv = self.controller.message_send(flow_mod_msg1)
+        self.assertTrue(rv != -1, "Error installing flow mod")
+        pa_logger.info("Inserting flow2")
+        rv = self.controller.message_send(flow_mod_msg2)
+        self.assertTrue(rv != -1, "Error installing flow mod")
+        do_barrier(self.controller)
+
+        num_pkt1s = random.randint(10,30)
+        pa_logger.info("Sending " + str(num_pkt1s) + " pkt1s")
+        num_pkt2s = random.randint(10,30)
+        pa_logger.info("Sending " + str(num_pkt2s) + " pkt2s")
+        for i in range(0,num_pkt1s):
+            self.sendPacket(pkt1, ingress_port, egress_port1, test_timeout)
+        for i in range(0,num_pkt2s):
+            self.sendPacket(pkt2, ingress_port, egress_port2, test_timeout)
+            
+        # loop on flow stats request until timeout
+        match = parse.packet_to_flow_match(pkt1)
+        match.wildcards |= ofp.OFPFW_DL_SRC
+        self.verifyAggFlowStats(match, ofp.OFPP_NONE, test_timeout, 
+                                2, num_pkt1s+num_pkt2s)
+
+        # out_port filter for egress_port1
+        self.verifyAggFlowStats(match, egress_port1, test_timeout, 
+                                1, num_pkt1s)
+
+        # out_port filter for egress_port1
+        self.verifyAggFlowStats(match, egress_port2, test_timeout, 
+                                1, num_pkt2s)