Latency generator?

From: "Temkin, David" <>
Date: Wed, 25 Jun 2003 12:48:29 -0400

Does anyone know of any free, cheap, or potentially rentable latency
generators? Ideally I'd like something that just sits between two ethernet
devices to induce layer 2/3 latency in traffic, but am open to any

dummynet(4)? It's a standard part of FreeBSD and may be in other BSDs.
It's very configurable to generate delays, congestion like behavior
and such.

     dummynet - traffic 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.