[olug] Active bandwidth monitoring

[George Neill]

All,

   I guess I am old skool, I have always used dd and netpipes to test line
speeds.

on the client side,

time dd bs=1048576 count=1000 if=/dev/zero | hose somehost someport --slave

and on the other side you have a faucet dd'ing input to /dev/null.

Then just do the math.

Later,
George.


On 7/18/07, Carl Lundstedt <clundst at unlserve.unl.edu> wrote:
>
> I second iperf.  We used it to exercise and test the new 10 Gbps link at
> UNL when it came online.  I was able to detect that our bonding wasn't
> working on some of our storage servers and tell that we were getting
> very close to line speed out of the fiber.
>
> Carl Lundstedt
> UNL
> > On 7/17/07, Christopher Cashell <topher-olug at zyp.org> wrote:
> >
> >> At Mon, 16 Jul 07, Unidentified Flying Banana Daniel Linder, said:
> >>
> >>> I'm trying to pro-actively monitor the "real world" speed that I'm
> >>>
> >> getting
> >>
> >>> with my @Work connection.
> >>>
> >>> Questions:
> >>> 1: Has anyone run across a tool like this that is free and will run on
> >>>
> >> Linux?
> >>
> >> If you have access to remote machines, iperf[0] will likely do the
> >> trick.  It runs as a client/server setup and allows you to measure
> >> various bandwidth/performance related statistics between the two hosts.
> >>
> >> It runs on most Unix variants, and is open source.
> >>
> >>
> >>> Dan
> >>>
> >> [0] http://dast.nlanr.net/Projects/Iperf/
> >>
> >> --
> >> | Christopher
> >> +------------------------------------------------+
> >> | Here I stand.  I can do no other.              |
> >> +------------------------------------------------+
> >>
> >> _______________________________________________
> >> OLUG mailing list
> >> OLUG at olug.org
> >> http://lists.olug.org/mailman/listinfo/olug
> >>
> >>
> >
> > Christopher, thank you for a great link.  I have been looking for a long
> > time for something to run on a lan to test different branded NIC drivers
> and
> > switches.  This should support LAN speeds.  Look forward to trying out
> > "Advisor" and "JPerf" along with it.
> >
> > http://dast.nlanr.net/projects/advisor/
> > http://dast.nlanr.net/Projects/Jperf/
> >
> > There is also a promising Bandwidth Meter project at Georgia Tech:
> > http://www.cc.gatech.edu/fac/Constantinos.Dovrolis/bw.html
> >
> > SmokePing http://oss.oetiker.ch/smokeping/index.en.html is a project
> that by
> > default would not take up much bandwidth.  The ping payload may be
> > configurable which could possibly be adapted to test bandwidth.  It can
> also
> > work with Nagios.
> > _______________________________________________
> > OLUG mailing list
> > OLUG at olug.org
> > http://lists.olug.org/mailman/listinfo/olug
> >
>
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