code: def send_ignore(self, bytes=None):
          
          m = Message()
          m.add_byte(chr(MSG_IGNORE))
          if bytes is None:
              bytes = (ord(rng.read(1)) % 32) + 10
          m.add_bytes(rng.read(bytes))
          self._send_user_message(m)
docs: Send a junk packet across the encrypted link.  This is sometimes used
          to add "noise" to a connection to confuse would-be attackers.  It can
          also be used as a keep-alive for long lived connections traversing
          firewalls.
  
          @param bytes: the number of random bytes to send in the payload of the
              ignored packet -- defaults to a random number from 10 to 41.
          @type bytes: int