diff --git a/tools/pylibopenflow/bin/pyopenflow-load-controller.py b/tools/pylibopenflow/bin/pyopenflow-load-controller.py
new file mode 100755
index 0000000..aef34f7
--- /dev/null
+++ b/tools/pylibopenflow/bin/pyopenflow-load-controller.py
@@ -0,0 +1,131 @@
+#!/usr/bin/env python2.5
+"""This script fakes as n OpenFlow switch and
+load the controller with k packets per second.
+
+(C) Copyright Stanford University
+Author ykk
+Date January 2010
+"""
+import sys
+import getopt
+import struct
+import openflow
+import time
+import output
+import of.msg
+import of.simu
+import of.network
+import dpkt.ethernet
+
+def usage():
+    """Display usage
+    """
+    print "Usage "+sys.argv[0]+" <options> controller\n"+\
+          "Options:\n"+\
+          "-p/--port\n\tSpecify port number\n"+\
+          "-v/--verbose\n\tPrint message exchange\n"+\
+          "-r/--rate\n\tSpecify rate per switch to send packets (default=1)\n"+\
+          "-d/--duration\n\tSpecify duration of load test in seconds (default=5)\n"+\
+          "-s/--switch\n\tSpecify number of switches (default=1)\n"+\
+          "-h/--help\n\tPrint this usage guide\n"+\
+          ""
+          
+#Parse options and arguments
+try:
+    opts, args = getopt.getopt(sys.argv[1:], "hvp:s:d:r:",
+                               ["help","verbose","port=",
+                                "switch=","duration=","rate="])
+except getopt.GetoptError:
+    usage()
+    sys.exit(2)
+
+#Check there is only controller
+if not (len(args) == 1):
+    usage()
+    sys.exit(2)
+    
+#Parse options
+##Duration
+duration = 5
+##Rate
+rate = 1.0
+##Switch number
+swno = 1
+##Port to connect to
+port = 6633
+##Set output mode
+output.set_mode("INFO")
+for opt,arg in opts:
+    if (opt in ("-h","--help")):
+        usage()
+        sys.exit(0)
+    elif (opt in ("-v","--verbose")):
+        output.set_mode("DBG")
+    elif (opt in ("-p","--port")):
+        port=int(arg)
+    elif (opt in ("-s","--switch")):
+        swno=int(arg)
+    elif (opt in ("-d","--duration")):
+        duration=int(arg)
+    elif (opt in ("-r","--rate")):
+        rate=float(arg)
+    else:
+        print "Unhandled option :"+opt
+        sys.exit(2)
+
+#Form packet
+pkt = dpkt.ethernet.Ethernet()
+pkt.type = dpkt.ethernet.ETH_MIN
+pkt.dst = '\xFF\xFF\xFF\xFF\xFF\xFF'
+
+#Connect to controller
+ofmsg = openflow.messages()
+parser = of.msg.parser(ofmsg)
+ofnet = of.simu.network()
+for i in range(1,swno+1):
+    ofsw = of.simu.switch(ofmsg, args[0], port,
+                          dpid=i,
+                          parser=parser)
+    ofnet.add_switch(ofsw)
+    ofsw.send_hello()
+    
+output.info("Running "+str(swno)+" switches at "+str(rate)+\
+            " packets per seconds for "+str(duration)+" s")
+
+starttime = time.time()
+running = True
+interval = 1.0/(rate*swno)
+ntime=time.time()+(interval/10.0)
+swindex = 0
+pcount = 0
+rcount = 0
+while running:
+    ctime = time.time()
+    time.sleep(max(0,min(ntime-ctime,interval/10.0)))
+
+    if ((ctime-starttime) <= duration):
+        #Send packet if time's up
+        if (ctime >= ntime):
+            ntime += interval
+            pkt.src = struct.pack("Q",pcount)[:6]
+            ofnet.switches[swindex].send_packet(1,10,pkt.pack()+'A'*3)
+            pcount += 1
+            swno += 1
+            if (swno >= len(ofnet.switches)):
+                swno=0
+
+        #Process any received message
+        (ofsw, msg) = ofnet.connections.msgreceive()
+        while (msg != None):
+            dic = ofmsg.peek_from_front("ofp_header", msg)
+            if (dic["type"][0] == ofmsg.get_value("OFPT_FLOW_MOD")):
+                output.dbg("Received flow mod")
+                rcount += 1
+            ofsw.receive_openflow(msg)
+            (ofsw, msg) = ofnet.connections.msgreceive()
+    else:
+        running = False
+    
+output.info("Sent "+str(pcount)+" packets at rate "+\
+            str(float(pcount)/float(duration))+" and received "+\
+            str(rcount)+" back")