This sample config assumes 4 WIC1ADSL cards installed to load balance 4 ADSL circuits:

service timestamps debug datetime msec
service timestamps log datetime msec localtime
service password-encryption
!
hostname whatever
!
boot-start-marker
boot-end-marker
!
logging buffered 16384 debugging
enable secret 5 someencryptednonsense
!
ip subnet-zero
no ip cef
!
!
!
ip name-server ip.address.of.dns
ip name-server ip.address.of.dns
no ftp-server write-enable
!
!
!
!
interface ATM0/0
no ip address
logging event atm pvc state
logging event subif-link-status
no atm ilmi-keepalive
dsl operating-mode auto
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 11
!
!
interface FastEthernet0/0
ip address 192.168.20.0 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
!
interface ATM0/1
no ip address
logging event atm pvc state
logging event subif-link-status
no atm ilmi-keepalive
dsl operating-mode auto
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 12
!
!
interface ATM1/0
no ip address
logging event atm pvc state
logging event subif-link-status
no atm ilmi-keepalive
dsl operating-mode auto
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 13
!
!
interface ATM1/1
no ip address
logging event atm pvc state
logging event subif-link-status
no atm ilmi-keepalive
dsl operating-mode auto
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 14
!
!
interface Dialer11
ip address negotiated
ip load-sharing per-packet
encapsulation ppp
logging event subif-link-status
dialer pool 11
dialer persistent
ppp authentication chap callin
ppp chap hostname your.login/id-ml2
ppp chap password 7 yourpassword
!
interface Dialer12
ip address negotiated
ip load-sharing per-packet
encapsulation ppp
logging event subif-link-status
dialer pool 12
dialer persistent
ppp authentication chap callin
ppp chap hostname your.login/id-ml2
ppp chap password 7 yourpassword
!
interface Dialer13
ip address negotiated
ip load-sharing per-packet
encapsulation ppp
logging event subif-link-status
dialer pool 13
dialer persistent
ppp authentication chap callin
ppp chap hostname your.login/id-ml2
ppp chap password 7 yourpassword
!
interface Dialer14
ip address negotiated
ip load-sharing per-packet
encapsulation ppp
logging event subif-link-status
dialer pool 14
dialer persistent
ppp authentication chap callin
ppp chap hostname your.login/id-ml2
ppp chap password 7 yourpassword
!
ip classless
ip route 0.0.0.0 0.0.0.0 ip.we.gave.you
no ip http server
!
snmp-server community whatever RO
snmp-server enable traps tty
!
line con 0
line aux 0
line vty 0 4
!
!
!