Re: Looking for tool that will create congestion between two applictions or nodes

[Martin Visser <martinvisser99 () gmail com>]

If you want to create congestion, I just use "iperf" from NLANR and
configure it as a client to sent a UDP stream at the bandwidth you want.
(Or use TCP to get it to hog as much as possible).

To simulate a bandwidth constrained network, I have used a linux box and
use the netem feature (configured using the tc commands, and using bridging
to to join the two interfaces that will be constrained with netem.

Regards, Martin

MartinVisser99 () gmail com


On 13 November 2011 12:26, Jeff Morriss <jeff.morriss.ws () gmail com> wrote:

> On 11/11/2011 04:59 PM, W T wrote:
>
> > Hi,
> >
> > I have a client and server running in two different machine, and
> > wanted to reduce the available bandwidth between these two machines
> > based on applications running in this machine.
> >
> > Is there any free tool available on Linux and windows platforms.
>
> After having used FreeBSD's dummynet (part of the ipfw package) at an IETF
> bakeoff, I started using it at work and have been very impressed. It
> doesn't have a lot of fancy features (like jitter), but if you're just
> looking for things like controlling bandwidth or injecting packet loss it
> works quite well--and it's rock solid (never a crash or hang; the FreeBSD
> box only goes down when it gets moved).
>
> The man page is probably all you'll ever need:
>
> http://www.freebsd.org/cgi/**man.cgi?query=ipfw&sektion=8#**
> TRAFFIC_SHAPER_%28DUMMYNET%29_**CONFIGURATION<http://www.freebsd.org/cgi/man.cgi?query=ipfw&sektion=8#TRAFFIC_SHAPER_%28DUMMYNET%29_CONFIGURATION>
>
> ps. Yes, I know you said you were looking for Linux or Windows, but...
> Maybe you could put FreeBSD in a VM.
>
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