network stress test tools
tradecraft at ixpres.com
Tue Sep 14 02:31:37 PDT 2004
On Mon, 2004-09-13 at 12:29, Cory Petkovsek wrote:
> On Mon, Sep 13, 2004 at 08:09:20AM -0700, Gus Wirth wrote:
> > I need to stress test some network infrastructure which includes a portion
> > with a wireless bridge. I want to be able to evaluate packet loss, packet
> > corruption and throughput over a several day period. TCP/IP is the obvious
> > protocol but it may also have to support Novell IPX. I'm trying to make the
> > IPX requirement go away. Do some of you have a favorite tool you could
> > recommend for doing something like this? I'm off to search Google and
> > Freshmeat now but I would appreciate first-hand reports.
> > Gus
> I know of no way to monitor the network as a whole for packet loss. However
> testing from single points (including routers/bridges) will give you individual
> stats. Use a utility that will copy files as you normally might. Write a
> script to mount a network drive, copy files to a temp dir and remove them.
> Then have it repeat every 15 minutes or so. Then on that node look at the
> network statistics:
> # netstat -i|egrep eth2\|Iface
> Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
> eth2 1500 0 1105520 0 0 0 1799796 0 0 0 BMRU
> # iwconfig eth2|egrep "Rx |Tx "
> Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
> Tx excessive retries:0 Invalid misc:0 Missed beacon:0
> Here is my wireless nic on my router. Lots of Oks, no drops on this side.
> Next look at netstat -s for much more detailed information. However this is
> per stack and not per interface.
> You could use a utility like tcpblast, ping -f and friends, however even on a
> wired network they will provide packet loss because they test extreme
> throughput that no network will see in practical application. You can also
> load the discard service (inetd) and use netcat or maybe tcpblast to dump a
> bunch of data to that port if you really want to do this kind of throughput
> testing, just expect packet loss (which is inherent anyway in networking which
> is why we have tcp).
> Cory Petkovsek Adapting Information
> Adaptable IT Consulting Technology to Your
> (858) 705-1655 Business
> cory at AdaptableIT.com www.AdaptableIT.com
I'm replying to Cory's reply because I stupidly deleted Gus' original by
mistake. At the Dag repository
http://dag.wieers.com/home-made/apt/packages.php I found an app called
hammerhead, which is supposed to be for network stress testing. I
haven't used it, but it's the only thing I know of.
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