Have you looked at the second FAQ entry in the POX manual? https://openflow.stanford.edu/display/ONL/POX+Wiki
-- Murphy On Jan 5, 2014, at 9:04 AM, ramesh oswal <rameshos...@gmail.com> wrote: > Sir i am trying to install a flow entry referring to the eg. given in pox > manual to install a flow entry in flow table > Code used > msg = of.ofp_flow_mod() > msg.priority = 42 > msg.match.dl_type = 0x800 > msg.match.nw_dst = IPAddr("192.168.101.101") > msg.match.tp_dst = 80 > msg.actions.append(of.ofp_action_output(port = 4)) > self.connection.send(msg) > It is showing me this given warning . > WARNING:libopenflow_01:Fields ignored due to unspecified prerequisites: tp_dst > > Can you help me with this warning > > Thank You >