Problem about adding method "tcpdump"

[kirsten]

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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