diff --git a/test/test_snat.py b/test/test_snat.py
index fe5af41..f90d906 100644
--- a/test/test_snat.py
+++ b/test/test_snat.py
@@ -1332,9 +1332,9 @@
 
         try:
             cls.tcp_port_in = 6303
-            cls.tcp_port_out = 6303
+            cls.tcp_external_port = 6303
             cls.udp_port_in = 6304
-            cls.udp_port_out = 6304
+            cls.udp_external_port = 6304
             cls.icmp_id_in = 6305
             cls.snat_addr = '10.0.0.3'
 
@@ -1365,13 +1365,13 @@
         # TCP
         p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) /
              IP(src=in_if.remote_ip4, dst=out_if.remote_ip4, ttl=ttl) /
-             TCP(sport=self.tcp_port_in, dport=self.tcp_port_out))
+             TCP(sport=self.tcp_port_in, dport=self.tcp_external_port))
         pkts.append(p)
 
         # UDP
         p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) /
              IP(src=in_if.remote_ip4, dst=out_if.remote_ip4, ttl=ttl) /
-             UDP(sport=self.udp_port_in, dport=self.udp_port_out))
+             UDP(sport=self.udp_port_in, dport=self.udp_external_port))
         pkts.append(p)
 
         # ICMP
@@ -1396,13 +1396,13 @@
         # TCP
         p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) /
              IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) /
-             TCP(dport=self.tcp_external_port, sport=self.tcp_port_out))
+             TCP(dport=self.tcp_port_out, sport=self.tcp_external_port))
         pkts.append(p)
 
         # UDP
         p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) /
              IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) /
-             UDP(dport=self.udp_external_port, sport=self.udp_port_out))
+             UDP(dport=self.udp_port_out, sport=self.udp_external_port))
         pkts.append(p)
 
         # ICMP
@@ -1429,9 +1429,9 @@
             try:
                 self.assertEqual(packet[IP].src, nat_ip)
                 if packet.haslayer(TCP):
-                    self.tcp_external_port = packet[TCP].sport
+                    self.tcp_port_out = packet[TCP].sport
                 elif packet.haslayer(UDP):
-                    self.udp_external_port = packet[UDP].sport
+                    self.udp_port_out = packet[UDP].sport
                 else:
                     self.icmp_external_id = packet[ICMP].id
             except:
@@ -1450,19 +1450,19 @@
             # SYN packet in->out
             p = (Ether(src=in_if.remote_mac, dst=in_if.local_mac) /
                  IP(src=in_if.remote_ip4, dst=out_if.remote_ip4) /
-                 TCP(sport=self.tcp_port_in, dport=self.tcp_port_out,
+                 TCP(sport=self.tcp_port_in, dport=self.tcp_external_port,
                      flags="S"))
             in_if.add_stream(p)
             self.pg_enable_capture(self.pg_interfaces)
             self.pg_start()
             capture = out_if.get_capture(1)
             p = capture[0]
-            self.tcp_external_port = p[TCP].sport
+            self.tcp_port_out = p[TCP].sport
 
             # SYN + ACK packet out->in
             p = (Ether(src=out_if.remote_mac, dst=out_if.local_mac) /
                  IP(src=out_if.remote_ip4, dst=self.snat_addr) /
-                 TCP(sport=self.tcp_port_out, dport=self.tcp_external_port,
+                 TCP(sport=self.tcp_external_port, dport=self.tcp_port_out,
                      flags="SA"))
             out_if.add_stream(p)
             self.pg_enable_capture(self.pg_interfaces)
@@ -1472,7 +1472,7 @@
             # ACK packet in->out
             p = (Ether(src=in_if.remote_mac, dst=in_if.local_mac) /
                  IP(src=in_if.remote_ip4, dst=out_if.remote_ip4) /
-                 TCP(sport=self.tcp_port_in, dport=self.tcp_port_out,
+                 TCP(sport=self.tcp_port_in, dport=self.tcp_external_port,
                      flags="A"))
             in_if.add_stream(p)
             self.pg_enable_capture(self.pg_interfaces)
@@ -1553,12 +1553,6 @@
         """ CGNAT translation test (TCP, UDP, ICMP) """
 
         nat_ip = "10.0.0.10"
-        self.tcp_port_out = 6303
-        self.udp_port_out = 6304
-        self.icmp_id_in = 6305
-        self.tcp_external_port = 7303
-        self.udp_external_port = 7304
-        self.icmp_id_out = 7305
 
         self.vapi.snat_add_det_map(self.pg0.remote_ip4n,
                                    32,
@@ -1584,12 +1578,36 @@
         capture = self.pg0.get_capture(len(pkts))
         self.verify_capture_in(capture, self.pg0)
 
+        # session dump test
+        sessions = self.vapi.snat_det_session_dump(self.pg0.remote_ip4n)
+        self.assertEqual(len(sessions), 3)
+
+        # TCP session
+        s = sessions[0]
+        self.assertEqual(s.ext_addr[:4], self.pg1.remote_ip4n)
+        self.assertEqual(s.in_port, self.tcp_port_in)
+        self.assertEqual(s.out_port, self.tcp_port_out)
+        self.assertEqual(s.ext_port, self.tcp_external_port)
+
+        # UDP session
+        s = sessions[1]
+        self.assertEqual(s.ext_addr[:4], self.pg1.remote_ip4n)
+        self.assertEqual(s.in_port, self.udp_port_in)
+        self.assertEqual(s.out_port, self.udp_port_out)
+        self.assertEqual(s.ext_port, self.udp_external_port)
+
+        # ICMP session
+        s = sessions[2]
+        self.assertEqual(s.ext_addr[:4], self.pg1.remote_ip4n)
+        self.assertEqual(s.in_port, self.icmp_id_in)
+        self.assertEqual(s.out_port, self.icmp_external_id)
+
     def test_multiple_users(self):
         """ CGNAT multiple users """
 
         nat_ip = "10.0.0.10"
         port_in = 80
-        port_out = 6303
+        external_port = 6303
 
         host0 = self.pg0.remote_hosts[0]
         host1 = self.pg0.remote_hosts[1]
@@ -1605,7 +1623,7 @@
         # host0 to out
         p = (Ether(src=host0.mac, dst=self.pg0.local_mac) /
              IP(src=host0.ip4, dst=self.pg1.remote_ip4) /
-             TCP(sport=port_in, dport=port_out))
+             TCP(sport=port_in, dport=external_port))
         self.pg0.add_stream(p)
         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()
@@ -1616,8 +1634,8 @@
             tcp = p[TCP]
             self.assertEqual(ip.src, nat_ip)
             self.assertEqual(ip.dst, self.pg1.remote_ip4)
-            self.assertEqual(tcp.dport, port_out)
-            external_port0 = tcp.sport
+            self.assertEqual(tcp.dport, external_port)
+            port_out0 = tcp.sport
         except:
             self.logger.error(ppp("Unexpected or invalid packet:", p))
             raise
@@ -1625,7 +1643,7 @@
         # host1 to out
         p = (Ether(src=host1.mac, dst=self.pg0.local_mac) /
              IP(src=host1.ip4, dst=self.pg1.remote_ip4) /
-             TCP(sport=port_in, dport=port_out))
+             TCP(sport=port_in, dport=external_port))
         self.pg0.add_stream(p)
         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()
@@ -1636,8 +1654,8 @@
             tcp = p[TCP]
             self.assertEqual(ip.src, nat_ip)
             self.assertEqual(ip.dst, self.pg1.remote_ip4)
-            self.assertEqual(tcp.dport, port_out)
-            external_port1 = tcp.sport
+            self.assertEqual(tcp.dport, external_port)
+            port_out1 = tcp.sport
         except:
             self.logger.error(ppp("Unexpected or invalid packet:", p))
             raise
@@ -1649,7 +1667,7 @@
         # out to host0
         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
              IP(src=self.pg1.remote_ip4, dst=nat_ip) /
-             TCP(sport=port_out, dport=external_port0))
+             TCP(sport=external_port, dport=port_out0))
         self.pg1.add_stream(p)
         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()
@@ -1661,7 +1679,7 @@
             self.assertEqual(ip.src, self.pg1.remote_ip4)
             self.assertEqual(ip.dst, host0.ip4)
             self.assertEqual(tcp.dport, port_in)
-            self.assertEqual(tcp.sport, port_out)
+            self.assertEqual(tcp.sport, external_port)
         except:
             self.logger.error(ppp("Unexpected or invalid packet:", p))
             raise
@@ -1669,7 +1687,7 @@
         # out to host1
         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
              IP(src=self.pg1.remote_ip4, dst=nat_ip) /
-             TCP(sport=port_out, dport=external_port1))
+             TCP(sport=external_port, dport=port_out1))
         self.pg1.add_stream(p)
         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()
@@ -1681,23 +1699,23 @@
             self.assertEqual(ip.src, self.pg1.remote_ip4)
             self.assertEqual(ip.dst, host1.ip4)
             self.assertEqual(tcp.dport, port_in)
-            self.assertEqual(tcp.sport, port_out)
+            self.assertEqual(tcp.sport, external_port)
         except:
             self.logger.error(ppp("Unexpected or invalid packet", p))
             raise
 
         # session close api test
         self.vapi.snat_det_close_session_out(socket.inet_aton(nat_ip),
-                                             external_port1,
+                                             port_out1,
                                              self.pg1.remote_ip4n,
-                                             port_out)
+                                             external_port)
         dms = self.vapi.snat_det_map_dump()
         self.assertEqual(dms[0].ses_num, 1)
 
         self.vapi.snat_det_close_session_in(host0.ip4n,
                                             port_in,
                                             self.pg1.remote_ip4n,
-                                            port_out)
+                                            external_port)
         dms = self.vapi.snat_det_map_dump()
         self.assertEqual(dms[0].ses_num, 0)
 
@@ -1718,7 +1736,7 @@
             # FIN packet in -> out
             p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
                  IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
-                 TCP(sport=self.tcp_port_in, dport=self.tcp_port_out,
+                 TCP(sport=self.tcp_port_in, dport=self.tcp_external_port,
                      flags="F"))
             self.pg0.add_stream(p)
             self.pg_enable_capture(self.pg_interfaces)
@@ -1730,14 +1748,14 @@
             # ACK packet out -> in
             p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
                  IP(src=self.pg1.remote_ip4, dst=self.snat_addr) /
-                 TCP(sport=self.tcp_port_out, dport=self.tcp_external_port,
+                 TCP(sport=self.tcp_external_port, dport=self.tcp_port_out,
                      flags="A"))
             pkts.append(p)
 
             # FIN packet out -> in
             p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
                  IP(src=self.pg1.remote_ip4, dst=self.snat_addr) /
-                 TCP(sport=self.tcp_port_out, dport=self.tcp_external_port,
+                 TCP(sport=self.tcp_external_port, dport=self.tcp_port_out,
                      flags="F"))
             pkts.append(p)
 
@@ -1749,7 +1767,7 @@
             # ACK packet in -> out
             p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
                  IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
-                 TCP(sport=self.tcp_port_in, dport=self.tcp_port_out,
+                 TCP(sport=self.tcp_port_in, dport=self.tcp_external_port,
                      flags="A"))
             self.pg0.add_stream(p)
             self.pg_enable_capture(self.pg_interfaces)
@@ -1780,7 +1798,7 @@
             # FIN packet out -> in
             p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
                  IP(src=self.pg1.remote_ip4, dst=self.snat_addr) /
-                 TCP(sport=self.tcp_port_out, dport=self.tcp_external_port,
+                 TCP(sport=self.tcp_external_port, dport=self.tcp_port_out,
                      flags="F"))
             self.pg1.add_stream(p)
             self.pg_enable_capture(self.pg_interfaces)
@@ -1792,14 +1810,14 @@
             # ACK packet in -> out
             p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
                  IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
-                 TCP(sport=self.tcp_port_in, dport=self.tcp_port_out,
+                 TCP(sport=self.tcp_port_in, dport=self.tcp_external_port,
                      flags="A"))
             pkts.append(p)
 
             # ACK packet in -> out
             p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
                  IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
-                 TCP(sport=self.tcp_port_in, dport=self.tcp_port_out,
+                 TCP(sport=self.tcp_port_in, dport=self.tcp_external_port,
                      flags="F"))
             pkts.append(p)
 
@@ -1811,7 +1829,7 @@
             # ACK packet out -> in
             p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
                  IP(src=self.pg1.remote_ip4, dst=self.snat_addr) /
-                 TCP(sport=self.tcp_port_out, dport=self.tcp_external_port,
+                 TCP(sport=self.tcp_external_port, dport=self.tcp_port_out,
                      flags="A"))
             self.pg1.add_stream(p)
             self.pg_enable_capture(self.pg_interfaces)