I turned up a 7Mbps DSL connection with CenturyLink this evening. Here’s the configuration I used to get the circuit working. The ‘debug ppp authentication command’ helped a lot, too.
Note: To get the username and password I had to call CenturyLink technical support. The CenturyLink provisioned modems must have some mechanism to get the necessary information automatically.
interface ATM0 no ip address no atm ilmi-keepalive dsl operating-mode auto pvc 0/32 dialer pool-member 1 protocol ppp dialer ! ! interface Dialer0 ip address negotiated ip nat outside ip nbar protocol-discovery encapsulation ppp dialer pool 1 ppp pap sent-username USERNAME password PASSWORD ! int FastEthernet0 ip nat inside ! ip nat inside source list 111 interface Dialer0 overload ! ip route 0.0.0.0 0.0.0.0 Dialer0 !