How to Install the DUMMYNET ipfw driver for Ubuntu 11.04

Hello, I am new for Linux, we are trying to host webpagetest in our Ubuntu 11.04, there have a step for install dummynet ipfw driver, but the document is for windows, not for linux, could you please help us for Linux (Ubuntu) verison ?:smiley:

Only the web server can run on Linux. The test agent needs to be on Windows (which is why the dummynet instructions are for Windows).

thanks Pat