I don't understand the question. I have setup lots of ATT DSL's and I generally use the craptastic Netopia to do PPPoE with the WAN bridged to LAN. Then I give the Firewall a static. A few times, when faced with the spectacularly-ultra-craptasic 2-Wire, I have bridged the CPE and done PPPoE on pfSense. In any case, the PPPoE login (generally with @static.att.net username) determines if your IP is static or dynamic, and what IP you get.