From: "Temkin, David" <temkin@sig.com> Date: Wed, 25 Jun 2003 12:48:29 -0400 Sender: owner-nanog@merit.edu

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 options...

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. NAME dummynet - traffic shaper, bandwidth manager and delay emulator DESCRIPTION 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. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634