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dummynet (4)
  • >> dummynet (4) ( FreeBSD man: Специальные файлы /dev/* )
  • Ключ dummynet обнаружен в базе ключевых слов.

  • BSD mandoc
     

    NAME

    
    
    dummynet
    
     - traffic shaper, bandwidth manager and delay emulator
    
     
    

    DESCRIPTION

    The system facility permits the control of traffic going through the various network interfaces, by applying bandwidth and queue size limitations, implementing different scheduling and queue management policies, and emulating delays and losses.

    The user interface for is implemented by the ipfw(8) utility, so please refer to the ipfw(8) manpage for a complete description of the capabilities and how to use it.  

    Kernel Options

    The following options in the kernel configuration file are related to operation:

    IPFIREWALL
    enable ipfirewall (required for )
    IPFIREWALL_VERBOSE
    enable firewall output
    IPFIREWALL_VERBOSE_LIMIT
    limit firewall output
    DUMMYNET
    enable operation
    HZ
    set the timer granularity

    Generally, the following options are required:

    options IPFIREWALL
    options DUMMYNET
    options HZ=1000         # strongly recommended
    

    Additionally, one may want to increase the number of mbuf clusters (used to store network packets) according to the sum of the bandwidth-delay products and queue sizes of all configured pipes.  

    SEE ALSO

    setsockopt(2), if_bridge4, ip(4), ipfw(8), sysctl(8)  

    HISTORY

    The facility was initially implemented as a testing tool for TCP congestion control by An Luigi Rizzo Aq luigi@iet.unipi.it , as described on ACM Computer Communication Review, Jan.97 issue. Later it has been modified to work at the IP and bridging levels, integrated with the ipfw(4) packet filter, and extended to support multiple queueing and scheduling policies.


     

    Index

    NAME
    DESCRIPTION
    Kernel Options
    SEE ALSO
    HISTORY


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