reset memories for second run

implementation/mininet_controller.py

@@ -607,7 +607,14 @@ def run(topology, test=None, limit=None, delay=None, shortcut=False):
     # if we want to create a timed failure (maybe while pinging), we can use a timer
     # router2_failure = Timer(15, introduce_failure(net["r2"], "r2-eth3"))
     global packet_counter_initialized
+    global packet_counter_memory
+    global shortcut_nftables_memory
+
+    # reset values in case of second execution in runtime
     packet_counter_initialized = False
+    packet_counter_memory = []
+    shortcut_nftables_memory = []
+
     net.start()
     # CLI(net)
     n = 1