def start(queue_num):
    nfqueue = NetfilterQueue()
    nfqueue.bind(queue_num, callback)
    try:
        nfqueue.run(block=True)
    finally:
        nfqueue.unbind()
def start(queue_num):
    nfqueue = NetfilterQueue()
    nfqueue.bind(queue_num, callback)
    try:
        nfqueue.run(block=True)
    finally:
        nfqueue.unbind()