[tproxy] Questions about tProxy

Hi all, It's my first contact with the list and would like to know if somebody can help me: I am needing a machine that works as squid transparent, where it I make all the one functions squid common, but that the solicitations leave with origin address IP of the internal customer. I found tProxy in the Net, and would like to know if somebody can help me in some questions: - tProxy necessarily needs to use the Zorp or it it works with the IPTables (since the Zorp has some rules based in the IPTables)? - what I need to install to have a functional machine of the form as I I cited previously? - it exists some good HOWTO about the tProxy installation (that is not the README of the product)? Thanks for all, -- Rodrigo Santos