It looks like zeroshell uses ipp2p to handle P2P traffic. I haven’t used it myself, but maybe this guide can help you.
Scroll down to the usage section. Again, I haven’t used this, but I thought it might get you on the right track. also, there are a number of people on this board using it.. If you haven’t already, just search for ipp2p, and you’ll get a lot of responses.