networking tool to fake upload and download speeds?

[doh-nut]

im testing out different traffic shaping settings on my firewall to see how gaming pings react with different levels of uploading. im wondering if there is such a tool as one that lets you specify a download or upload speed, then it artificially transfers that as if you are really downloading something or uploading something via your internet connection.

I tried bittorrents, but it just isn't accurate enough for my tests. thanks for any help

 

[Tink]

are you looking for something like this or did i not understand your question

http://freshmeat.net/projects/trafficgenerator/

some reading material on the same topic

http://www.icir.org/models/trafficgenerators.html