This target passes the packet to userspace using the nfnetlink_queue handler. The packet is put into the queue identified by its 16-bit queue number. Userspace can inspect and modify the packet if desired. Userspace must then drop or reinject the packet into the kernel. Please see libnetfilter_queue for details. nfnetlink_queue was added in Linux 2.6.14. The queue-balance option was added in Linux 2.6.31, queue-bypass in 2.6.39.

--queue-num value
    This specifies the QUEUE number to use. Valid queue numbers are 0 to 65535. The default value is 0.

--queue-balance value:value
    This specifies a range of queues to use. Packets are then balanced across the given queues. This is useful for multicore systems: start multiple instances of the userspace program on queues x, x+1, .. x+n and use "--queue-balance x:x+n". Packets belonging to the same connection are put into the same nfqueue.

--queue-bypass
    By default, if no userspace program is listening on an NFQUEUE, then all packets that are to be queued are dropped. When this option is used, the NFQUEUE rule behaves like ACCEPT instead, and the packet will move on to the next table.

--queue-cpu-fanout
    Available starting Linux kernel 3.10. When used together with --queue-balance this will use the CPU ID as an index to map packets to the queues. The idea is that you can improve performance if there's a queue per CPU. This requires --queue-balance to be specified.