[109735] in North American Network Operators' Group
Re: Stress Testing LAN/WAN
daemon@ATHENA.MIT.EDU (Brad Fleming)
Thu Dec 4 18:38:20 2008
From: Brad Fleming <bdfleming@kanren.net>
To: nanog@nanog.org
In-Reply-To: <485ED9BA02629E4BBBA53AC892EDA50E0802874D@usmsxt104.mwd.h2o>
Date: Thu, 4 Dec 2008 17:37:38 -0600
Errors-To: nanog-bounces@nanog.org
With iperf, you can use the -d option to initiate a "real-time
parallel" test (my term). You can also use the -r option to run a
"trade-off parallel" test (again, my term).
To see the other options iperf offers:
http://pirlwww.lpl.arizona.edu/resources/guide/software/iperf/
Sounds like you might also be interested in the -B option. When
coupled with multiple interfaces, you can pretty easily test QoS
configs by sourcing from different interfaces / IPs (if that's your
identifying characteristic).
KanREN uses iperf on Mac Minis running OSX 10.5 with great results.
The newer Minis can pretty easily push 950+Mbps if you run 4 or more
streams (-n option). Or at least that has been our experience.
I would also suggest doing some TCP buffer tuning if you anticipate
round-trip latency to be >20ms. Here are some general guidelines for
various platforms:
http://fasterdata.es.net/TCP-tuning//
On Dec 4, 2008, at 5:08 PM, Holmes,David A wrote:
> I have used Solarwinds Wan Killer, but have yet to discover a method
> of
> initiating round-trip traffic from a single generator, but Solarwinds
> can stress a GiGE MAN link using a desktop PC with a GiGE card as the
> generator.
--
Brad Fleming
Network Engineer
Kansas Research and Education Network
Office: 785-856-9800 x.222
Moblie: 785-865-7231
NOC: 866-984-3662
