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-rw-r--r--test/test_nat.py61
1 files changed, 61 insertions, 0 deletions
diff --git a/test/test_nat.py b/test/test_nat.py
index 79d26224ad0..73e414ad1ae 100644
--- a/test/test_nat.py
+++ b/test/test_nat.py
@@ -3741,6 +3741,67 @@ class TestNAT44EndpointDependent(MethodHolder):
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
+ def test_lb_affinity(self):
+ """ NAT44 local service load balancing affinity """
+ external_addr_n = socket.inet_pton(socket.AF_INET, self.nat_addr)
+ external_port = 80
+ local_port = 8080
+ server1 = self.pg0.remote_hosts[0]
+ server2 = self.pg0.remote_hosts[1]
+
+ locals = [{'addr': server1.ip4n,
+ 'port': local_port,
+ 'probability': 50,
+ 'vrf_id': 0},
+ {'addr': server2.ip4n,
+ 'port': local_port,
+ 'probability': 50,
+ 'vrf_id': 0}]
+
+ self.nat44_add_address(self.nat_addr)
+ self.vapi.nat44_add_del_lb_static_mapping(external_addr_n,
+ external_port,
+ IP_PROTOS.tcp,
+ affinity=10800,
+ local_num=len(locals),
+ locals=locals)
+ self.vapi.nat44_interface_add_del_feature(self.pg0.sw_if_index)
+ self.vapi.nat44_interface_add_del_feature(self.pg1.sw_if_index,
+ is_inside=0)
+
+ p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
+ IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
+ TCP(sport=1025, dport=external_port))
+ self.pg1.add_stream(p)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = self.pg0.get_capture(1)
+ backend = capture[0][IP].dst
+
+ sessions = self.vapi.nat44_user_session_dump(
+ socket.inet_pton(socket.AF_INET, backend), 0)
+ self.assertEqual(len(sessions), 1)
+ self.assertTrue(sessions[0].ext_host_valid)
+ self.vapi.nat44_del_session(
+ sessions[0].inside_ip_address,
+ sessions[0].inside_port,
+ sessions[0].protocol,
+ ext_host_address=sessions[0].ext_host_address,
+ ext_host_port=sessions[0].ext_host_port)
+
+ pkts = []
+ for port in range(1030, 1100):
+ p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
+ IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
+ TCP(sport=port, dport=external_port))
+ pkts.append(p)
+ self.pg1.add_stream(pkts)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = self.pg0.get_capture(len(pkts))
+ for p in capture:
+ self.assertEqual(p[IP].dst, backend)
+
def test_unknown_proto(self):
""" NAT44 translate packet with unknown protocol """
self.nat44_add_address(self.nat_addr)