You should probably take a look at the POX FAQ.  The second and third questions 
probably directly relate.

-- Murphy

On Nov 4, 2014, at 11:30 PM, farshad tajedin <farshad.taje...@gmail.com> wrote:

> hi all
> i have a problem with add_flow entry in my switches. this is my code:
> 
> msg=of.ofp_flow_mod()
> msg.match.nw_src="something"
> msg.match.nw_dst="something"
> msg.match.tp_dst=21
> msg.match.tp_src="somthing"
> msg.actions.append(of.ofp_action_output(port="something"))
> 
> 
> and i send this msg to switch, when i read flow entry of switch 
> msg.match.tp_src and msg.match.tp_dst are None. i dont know why 
> Best Regards
> 
> Farshad Tajedin

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