dummynet(4) [opensolaris man page]

DUMMYNET(4)                                                BSD Kernel Interfaces Manual                                                DUMMYNET(4)

NAME

     dummynet -- traffic shaper, bandwidth manager and delay emulator

DESCRIPTION

     The dummynet 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 dummynet is implemented by the ipfw(8) utility, so please refer to the 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
           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_bridge(4), ip(4), ipfw(8), sysctl(8)

HISTORY

     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 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.

BSD                                                              October 28, 2002                                                              BSD

IPFW(4)                                                    BSD Kernel Interfaces Manual                                                    IPFW(4)

NAME

     ipfw -- IP packet filter and traffic accounting

SYNOPSIS

     To compile ipfw into the kernel, place the following option in the kernel configuration file:

           options IPFIREWALL

     Other kernel options related to ipfw which may also be useful are:

           options IPFIREWALL_DEFAULT_TO_ACCEPT
           options IPFIREWALL_FORWARD
           options IPFIREWALL_VERBOSE
           options IPFIREWALL_VERBOSE_LIMIT=100

     To load ipfw as a module at boot time, add the following line into the loader.conf(5) file:

           ipfw_load="YES"

DESCRIPTION

     The ipfw system facility allows filtering, redirecting, and other operations on IP packets travelling through network interfaces.

     The default behavior of ipfw is to block all incoming and outgoing traffic.  This behavior can be modified, to allow all traffic through the
     ipfw firewall by default, by enabling the IPFIREWALL_DEFAULT_TO_ACCEPT kernel option.  This option may be useful when configuring ipfw for
     the first time.  If the default ipfw behavior is to allow everything, it is easier to cope with firewall-tuning mistakes which may acciden-
     tally block all traffic.

     To enable logging of packets passing through ipfw, enable the IPFIREWALL_VERBOSE kernel option.  The IPFIREWALL_VERBOSE_LIMIT option will
     prevent syslogd(8) from flooding system logs or causing local Denial of Service.  This option may be set to the number of packets which will
     be logged on a per-entry basis before the entry is rate-limited.

     Policy routing and transparent forwarding features of ipfw can be enabled by IPFIREWALL_FORWARD kernel option.

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

SEE ALSO

     setsockopt(2), divert(4), ip(4), ipfw(8), sysctl(8), syslogd(8), pfil(9)

BSD                                                              September 1, 2006                                                             BSD