Use VLAN-tagged packet to avoid ill-defined semantics of VLAN ID 0
diff --git a/tests/pktact.py b/tests/pktact.py
index ff6927f..d543bd7 100644
--- a/tests/pktact.py
+++ b/tests/pktact.py
@@ -1953,7 +1953,7 @@
 
         delete_all_flows(self.controller)
 
-        pkt = simple_tcp_packet()
+        pkt = simple_tcp_packet(dl_vlan_enable=True, dl_vlan=2)
         ingress_port = of_ports[0]
         egress_port = of_ports[1]