Cisco 837 ios configuration

Looking for a cisco 837 config. Aim is to have the unit configured in a 'bridged' or 'half-bridged' mode I am not sure of the terminology. Basically BT ADSL internet connection, router needs PPPoA type dialler with username and password. I need the router to work in a similar fashion to the way ISP's provide managed routers. ie Non-nat, allowing 5 public ip addresses to be fully accessible on the LAN interface. This is to allow us to stick a different vpn and proxy appliance on the LAN interface.