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4 .Dd October 28, 2002
5 .Dt DUMMYNET 4
6 .Os Darwin
7 .Sh NAME
8 .Nm dummynet
9 .Nd traffic shaper, bandwidth manager and delay emulator
10 .Sh DESCRIPTION
11 .Em dummynet
12 is a system facility that permits the control of traffic
13 going through the various network interfaces, by applying bandwidth
14 and queue size limitations, implementing different scheduling and queue
15 management policies, and emulating delays and losses.
16 .Pp
17 The user interface for
18 .Em dummynet
19 is implemented by the
20 .Nm dnctl
21 program, so the reader is referred to the
22 .Xr dnctl 8
23 manpage for a complete description of the capabilities of
24 .Nm
25 and on how to use it.
26 .Sh SEE ALSO
27 .Xr dnctl 8 ,
28 .Xr setsockopt 2 ,
29 .Xr bridge 4 ,
30 .Xr ip 4 ,
31 .Xr sysctl 8
32 .Sh HISTORY
33 .Nm
34 was initially implemented as a testing tool for TCP congestion control
35 by
36 .An Luigi Rizzo Aq luigi@iet.unipi.it ,
37 as described on ACM Computer Communication Review, Jan.97 issue.
38 Later it has been then modified to work at the ip and bridging
39 level, integrated with the IPFW packet filter, and extended to
40 support multiple queueing and scheduling policies.