Ubuntu Feisty 7.04 manual page repository

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      dummynet - traffic shaper, bandwidth manager and delay emulator


      The dummynet system facility permits the control of traffic going through
      the various network interfaces, by applying bandwidth and queue size lim‐
      itations, implementing different scheduling and queue management poli‐
      cies, and emulating delays and losses.
ipfw(8) utility, so
ipfw(8) manpage for a complete description of the
      dummynet capabilities and how to use it.
    Kernel Options
      The following options in the kernel configuration file are related to
      dummynet operation:
            IPFIREWALL                enable ipfirewall (required for dummynet)
            IPFIREWALL_VERBOSE        enable firewall output
            IPFIREWALL_VERBOSE_LIMIT  limit firewall output
            DUMMYNET                  enable dummynet operation
            NMBCLUSTERS               set the amount of network packet buffers
            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.


      The dummynet facility was initially implemented as a testing tool for TCP
      congestion control by Luigi Rizzo 〈luigi@iet.unipi.it〉, as described on
      ACM Computer Communication Review, Jan.97 issue.  Later it has been modi‐
      packet filter, and extended to support multiple queueing and scheduling


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