[tproxy] how to forward client ip form transperent squid

Sir, we have some squid server running and they only forward 1 ip address as a source address on behalf of all the hosts behind proxy.They are all configured as a transparent proxy.So I could not do filtering based on ip address before gateway.Is there any solution to make squid to forward original client's ip address. Is tproxy a solution for that. Dhruba