Configuring a Cisco 1700/2600/3600 ADSL WIC With IP Unnumbered E0, DHCP, PPPoA, and PPP-PAP
! 
version 12.1
service timestamps debug datetime msec 
service timestamps datetime msec 
! 
hostname R1 
! 
ip subnet-zero 
! 
ip dhcp excluded-address 10.0.0.1

!--- The DHCP pool does not lease this address; 
!--- it is used by FastEthernet0.

!
ip dhcp pool<pool name>
network 10.0.0.0 255.0.0.0

!--- You need to adjust this for your range of addresses.

default-router 10.0.0.1

!--- The default gateway is assigned to the local devices.

! 
interface FastEthernet0
ip address 10.0.0.1 255.0.0.0
no ip directed-broadcast
no ip mroute-cache
! 
interface ATM0 
no ip address 
no ip directed-broadcast 
no ip mroute-cache 
no atm ilmi-keepalive
pvc 1/150 
encapsulation aal5mux ppp dialer 
dialer pool-member 1 
!
hold-queue 224 in 
! 
interface Dialer0 
ip unnumbered Ethernet0 
no ip directed-broadcast 
encapsulation ppp 
dialer pool 1 
dialer-group 1 
ppp pap sent-username username password password

! 
ip classless 
ip route 0.0.0.0 0.0.0.0 Dialer0 
no ip http server 
! 
dialer-list 1 protocol ip permit
! 
end