Connecting a pfSense wall behind a Cisco 4507e

No proxy any where. We are set up basically like an ISP th only purpose that the ASA serves on the top end its to break apart our 2 class Cs that we own and forward the traffic to the individual Buildings. We dont have a proxy on that network its up to the individual buildings to put one  in line behind their firewalls if they want one. They are also not allowed to run a transparent outside of their firewalls.