Wireshark-users: [Wireshark-users] Network impairment generator software?

From: "RUOFF, LARS (LARS)** CTR **" <lars.ruoff@xxxxxxxxxxxxxxxxxx>
Date: Wed, 8 Sep 2010 09:40:22 +0200
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.
 
thanks,
Lars Ruoff