Just a short example what you need to configure when use PPPoE on Cisco ASA…
vpdn group myconnection request dialout pppoe vpdn group myconnection localname [email protected] vpdn group myconnection ppp authentication pap vpdn username [email protected] password aeb1puj43 interface Vlan 2 nameif outside security-level 0 pppoe client vpdn group myconnection ip address pppoe setroute no shutdown exit