[89318] in North American Network Operators' Group
Re: AW: UDP Badness [Was: Re: How to measure network
daemon@ATHENA.MIT.EDU (David Nolan)
Tue Mar 7 13:12:09 2006
Date: Tue, 07 Mar 2006 13:11:44 -0500
From: David Nolan <vitroth+@cmu.edu>
To: nanog@nanog.org
In-Reply-To: <000701c64210$e0f26610$ca00a8c0@stzffm>
Errors-To: owner-nanog@merit.edu
--On Tuesday, March 07, 2006 18:59:27 +0100 Gunther Stammwitz
<gstammw@gmx.net> wrote:
>
> You are right - but there must be some sort of tool that can generate udp
> packets at a specified rate (or bandwidth) and measure if they are
> arriving in order, if there is loss and what the jitter is or something
> like that. Does anyone know some kind of tool?
iperf. http://dast.nlanr.net/Projects/Iperf/
I regularly use iperf to stress test various network components. In TCP
mode it will show you how fast a tcp stack can negotiate to, in UDP mode it
can throw packets at a fixed rate and the server can tell you how many it
got.
There is also NDT, http://e2epi.internet2.edu/ndt/, but that requires a
kernel with the web100 patches to instrument the kernel network stack.
-David Nolan
Network Software Designer
Computing Services
Carnegie Mellon University
