ADSL

From FrogspawnWiki

Firstly configure the ATM interface

interface ATM1/0
 no ip address
 no ip mroute-cache
 no atm ilmi-keepalive
 dsl operating-mode auto
 pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
!

pvc 0/38 is appropriate for the UK (where I live), you may need different. That PVC is being made a member of dialer pool 1.

Next configure the dialer interface

interface Dialer1
 ip address negotiated
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 no cdp enable
 ppp authentication chap pap callin
 ppp chap hostname ADSL_USERNAME
 ppp chap password ADSL_PASSWORD
 ppp pap sent-username ADSL_USERNAME password ADSL_PASSWORD
 ppp ipcp dns request
 ppp ipcp wins request
!

Obviously replace ADSL_USERNAME and ADSL_PASSWORD with the username and password respectively that you receive from the ISP.

CDP will be disabled on this interface because it's an external interface and we don't want no CDP on it.

This dialer interface is being placed into dialer pool 1. This associates it with the PVC that we configured under the ATM interface above. To bring the PVC up the router will use this dialer.

Any config that you'd normally apply to an external interface, NAT etc., needs to be applied to this dialer interface.

Finally add a default route, and set up so that any IP traffic is deemed interesting to the dialer.

ip route 0.0.0.0 0.0.0.0 Dialer1
dialer-list 1 protocol ip permit