Problem about adding method "tcpdump"

[kirsten <liujun.neu@xxxxxxxxxxx>]

I wanted to add a method "tcpdump" in networktest.py, but it did not
work. Attachment is the output. 

Is it because tcpdump needs root to run it? 

Here is the added code,

    def tcpdump(self, *args):
        return self.__run_command('/usr/sbin/netstat',
                                  self.__args_to_list(args))

    def register_method_args(self):
        """
        Implementing method getter part
        """

        return{

                'tcpdump':{
                    'args':{
                    'args':{
                        'type':'list*',
                        'optional':False,
                        'description':"Options for tcpdump command"
                            }},
                    'description':"The unix tcpdump command utility"
                    },

Another question, "register_method_args(self)" is included in a lot of
modules. What is it used for? I am a beginner of func & python...
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Attachment: erro_tcpdump.jpg
Description: JPEG image

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