diff --git a/scripts/runiperf.sh b/scripts/runiperf.sh
index ec903e3..92b912d 100755
--- a/scripts/runiperf.sh
+++ b/scripts/runiperf.sh
@@ -37,7 +37,7 @@
       print killcmd
       print cmd
     else:
-      cmd="ssh -o StrictHostKeyChecking=no 1.1.%d.1 '/home/ubuntu/ONOS/scripts/iperf -u -t%s -i%s -k%s -yJ -o /home/ubuntu/ONOS/web/log/iperfclient_%s.out -c 192.168.%d.%d 2>&1 &' &" % (src_hostid, duration, interval, samples, flowid, dst_nwid, dst_hostid)
+      cmd="ssh -o StrictHostKeyChecking=no 1.1.%d.1 '/home/ubuntu/ONOS/scripts/iperf -l 1000 -u -t%s -i%s -k%s -yJ -o /home/ubuntu/ONOS/web/log/iperfclient_%s.out -c 192.168.%d.%d 2>&1 &' &" % (src_hostid, duration, interval, samples, flowid, dst_nwid, dst_hostid)
       killcmd='pkill -KILL -f \"iperf .* -o .*/iperfclient_%s.out\"' % (flowid)
       print killcmd
       print cmd