Wireshark-users: Re: [Wireshark-users] Network impairment generator software?
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From: Jeff Morriss <jeff.morriss.ws@xxxxxxxxx>
Date: Wed, 08 Sep 2010 13:18:46 -0400
RUOFF, LARS (LARS)** CTR ** wrote:

Hello,
anyone knows a good network impairment generator software? One that is using a PC with two NICs, on which you relay packets from one NIC to the other with user defined packet loss, jitter etc. 
I used to use Netdisturb some time back.
Does anybody know something else? Possibly free software?
Windows or Linux based.
I used NistNet some years ago but found it too unstable (machine was hanging/crashing all the time). 

Since then I've used FreeBSD's ipfw dummynet/traffic shaper:

http://www.freebsd.org/cgi/man.cgi?query=ipfw&sektion=8&apropos=0&manpath=FreeBSD+8.1-RELEASE#TRAFFIC_SHAPER_(DUMMYNET)_CONFIGURATION
It's rock solid in my experience. But, it has limited functionality compared to some other products (e.g., you can't do jitter). But that fit's my needs: I generally want to control packet loss and occasionally mis-order packets. 


I think my company also uses this product:

http://www.shunra.com/ve-cloud
Complaints that I know of is that it's not free and (at least in the--probably old--version we have) it's not easy to automate tests with it.