global name 'do_traceroute' is not defined?

I got the error message:  "NameError: global name 'do_traceroute' is not defined". Can anyone help me find what is wrong with my python code below?

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import thread
import os

class Connecter:

... ...

    def do_traceroute():
        os.system('traceroute www.google.com')

        ... ...

    def got_message(self, connection, message):
 
        ... ...

            print 'Here is a test!'
            thread.start_new(do_traceroute, ())

        ... ...


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