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Re: Traffic generator for loadbalancer test
From: John Hall <j.hall () f5 com>
Date: Thu, 10 May 2001 13:43:37 -0700

Several possibilities below:

http_load (http://www.acme.com/software/http_load) is a good tool,
although it takes some liberties that can in some cases make it
not-at-all representative of real-life performance.  It's HTTPS
support is especially non-representative, because it does not
shortcut an ACK resend problem in the SSL protocol that almost all
web clients do shortcut, causing a .2 second delay in every transaction.
If you have enough clients (say 50), the delay per connection is
small enough to disregard.

For arbitrary protocols, we've found that Perl's Net::RawIP
(http://quake.skif.net/RawIP/) to be surprisingly efficient.  You still
need lots of clients, but it's easy to code a distributed benchmarking
tool in Perl with it.

Get the source for a WHOIS and wrap a for loop around the send() call.

DNSflood.pl (http://packetstorm.securify.com/DoS/dnsflood.pl).  Sends
requests with spoofed source addresses.  BE CAREFUL!!! If you're not
on an isolated network, the responses to the spoofed requests can leak
out of your network, causing hate mail, bandwidth throttling, embarrassment,
and possibly camel toe!

The DoS section of PacketStorm (http://packetstorm.securify.com/DoS) can
be a great source of benchmarking tools!

Good luck.


Arnold Nipper wrote:

I am looking for a traffic generator for stresstesting load balancers. Has
anyone an idea if there is software or anything else? I'm particularly
interested in testtraffic for DOMAIN and WHOIS.

Thanks, Arnold
Arnold Nipper / nIPper consulting          mailto:arnold () nipper de
Heilbronner Str. 34b                       Phone:  +49 700 NIPPER DE
D-76131 Karlsruhe                          Mobile: +49 172 2650958
Germany                                    Fax:    +49 180 505255469743

John Hall <jhall () f5 com>                                      F5 Networks, Inc.
BIG-IP Test Manager                                           206-272-5555

"But what we need to know is, do people want nasally-insertable computers?"

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