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
!