def send_ignore(self, bytes=None):
m = Message()<EOL>m.add_byte(chr(MSG_IGNORE))<EOL>if bytes is None:<EOL><INDENT>bytes = (ord(rng.read(<NUM_LIT:1>)) % <NUM_LIT:32>) + <NUM_LIT:10><EOL><DEDENT>m.add_bytes(rng.read(bytes))<EOL>self._send_user_message(m)<EOL>
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