Network impairment generator software?

["RUOFF, LARS (LARS)** CTR **" <lars.ruoff () alcatel-lucent com>]

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


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