Wireshark · Wireshark-users: Re: [Wireshark-users] Looking for tool that will create congestion between two applictions or nodes

[Martin Visser <martinvisser99@xxxxxxxxx>]

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@xxxxxxxxx

On 13 November 2011 12:26, Jeff Morriss <jeff.morriss.ws@xxxxxxxxx> 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

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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