Transparent shaper (NAT off, DHCP Off)

[davefl]

Hello I might have posted this in the wrong place before (over in the shaping forum?) so I guess I will post it here and wherever it does not belong the mods may take care of it. :)

Hello.

I have the following setup:

CABLE MODEM (Public IP) <–---------------> Wireless Router (192.168.1.x)

What I would like to do is:

CABLE MODEM (Public IP) <---- pfSense  ----> Wireless Router (192.168.1.x)

I need pfSense for traffic shaping purposes.  I need it to work transparently.  No Nat on pfsense, instead that will be handled by the Wireless Router.  Also it should truly be transparent -- the computers on the wireless router should not have to modify their configuration.

The trouble is that the IP from the Cable Modem is dynamic and must be gathered from DHCP.

Can pfSense do this?  If so, how?

I notice from the documentation: http://pfsense.trendchiller.com/transparent_firewall.pdf that it seems as if the WAN must have a static IP.  Perhaps I am in error?

Thank you.