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DUMMYNET(4) FreeBSD 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 lim-
itations, implementing different scheduling and queue management poli-
cies, 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), bridge(4), 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 modi-
fied to work at the IP and bridging levels, integrated with the ipfw(4)
packet filter, and extended to support multiple queueing and scheduling
policies.
FreeBSD 6.2 October 28, 2002 FreeBSD 6.2
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Wed Sep 19 20:31:08 BST 2007
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