DUMMYNET(4) Device Drivers Manual DUMMYNET(4)

dummynettraffic shaper, bandwidth manager and delay emulator

dummynet is a system facility that 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 dnctl program, so the reader is referred to the dnctl(8) manpage for a complete description of the capabilities of dummynet and on how to use it.

dnctl(8), setsockopt(2), bridge(4), ip(4), sysctl(8)

dummynet 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 then modified to work at the ip and bridging level, integrated with the IPFW packet filter, and extended to support multiple queueing and scheduling policies.

October 28, 2002 Darwin