This program/software is Large Scale Network Address Translation(LSNAT, CGN, LSN) for verification test.

  - runnning under the certain operating systems are available to use divert socket

  - add kernel options
    - must
      - options IPDIVERT
      - options IPFIREWALL
    - either way..
      - options IPFIREWALL_FORWARD
      - optionsIPFIREWALL_DEFAULT_TO_ACCEPT
      - options IPFIREWALL_VERBOSE
      - options IPFIREWALL_VERBOSE_LIMIT=1000

  - use library/software
    - natporte
      - c/c++
      - libboost(later 1.48.0)
      - google-perftools for libtcmalloc(later 1.8.3)
      - compile options
        -DDEBUG
        -DWAIT_TIME_DELETE
        -DOPT_HOSTID
        -DIP_CHECKSUM
        -DDIFF_CKSUM

    - pool_server
      - nodejs
      - npm
        - npm install opts
        - npm install forever -g

  - using pool server
    - Usage: node ./pool_server [options]
    - show help command
        -h, --help
    - set udp session timeout [sec] (default:10)
        -u, --udptimeout <value>
    - set tcp session timeout [sec] (default:3600)
        -t, --tcptimeout <value>
    - set maximum connections (default:100)
        -m, --max <value>
    - set end port number (default:65534)
        -e, --end <value>
    - set start port number (default:4097)
        -s, --start <value>
    - show interval debug messages
        -i, --idebug
    - show debug messages
        -d, --debug
    - show natporte's pool server version
        -v, --version

  - using natporte
    - Usage: ./natporte -w ifname -l ifname                                       
        - w: Wan interface name   [must]                         
        - l: Lan interface name   [must]                         
        - a: Addrpool port number [default:(tcp)8668]            
        - d: Divert port number   [default:(divert)8668]         
        - r: send back to Reset when tcp session already limited 
        - b: ring Buffer size using by pool server communitacion 
        - n: force Negated the DF flag effect                    
        - h: adding Hostid (compile option)
        - v: Verbose mode (compile option)

  - natctl.sh
    - natctl.sh is simple script for starting natporte.
    - It has a few parameters which are following.
      - LAN_IF
        - local area network side interface
      - WNA_IF
        - wide area network side intertace
      - FILTER_NUM
        - injection number of ipfw
      - DIVERT_PORT_IO
        - divert socket's port number(default:8668)