This is a sample PPP over Ethernet (PPPoE) PIX/ASA configuration:
vpdn group pppoegroup request dialout pppoe
vpdn group pppoegroup localname abccompany
vpdn username abccompany password abc12345
vpdn group pppoegroup ppp authentication PAP
ip address outside pppoe setroute
Note: The commands in italics are user supplied. The localname and password are assigned by your Internet Service Provider (ISP). The optional setroute parameter is used to obtain the default route from the PPPoE server. PPPoE is not supported in PIX/ASA ver 7.0 and 7.1.
Refer to these documents for more information: