ADSL

PPPoA

interface Vlan1
 ip tcp adjust-mss 1452
 exit

interface ATM0
 no ip address
 no atm ilmi-keepalive
 dsl operating-mode auto 
 exit

interface ATM0.1 point-to-point
 pvc 8/48 
  encapsulation aal5mux ppp dialer
  dialer pool-member 1 
  exit
 exit 

interface Dialer0
 ip address negotiated
 ip nat outside
 ip virtual-reassembly
 zone-member security WAN
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 no cdp enable
 ppp authentication pap callin
 ppp pap sent-username 487834430@bluetone.adsl password 7 101A514E5D44465F5F54  
 exit

dialer-list 1 protocol ip permit
 exit

PPPoE

interface Vlan1
 ip tcp adjust-mss 1412
 exit

interface ATM0
 no ip address
 no atm ilmi-keepalive
 dsl operating-mode auto 
 exit

interface ATM0.1 point-to-point
 pvc 8/48 
  pppoe-client dial-pool-number 1
  exit
 exit

interface Dialer1
 description PPoE
 ip address negotiated
 ip mtu 1452
 ip nat outside
 ip virtual-reassembly
 zone-member security WAN
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 no cdp enable
 ppp authentication pap callin
 ppp pap sent-username O2 password O2
 exit

dialer-list 1 protocol ip permit
 exit

PPPoE Cisco 1751

vpdn enable
!
vpdn-group 1
 request-dialin
  protocol pppoe

interface Gi0/1
 no ip address
 speed auto
 pppoe enable
 pppoe-client dial-pool-number 1

interface Dialer1
 ip address negotiated
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 ppp pap sent-username O2 password 0 O2

dialer-list 1 protocol ip permit

Router#sh ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
Ethernet0/0                10.10.204.60    YES NVRAM  up                    up
FastEthernet0/0            unassigned      YES NVRAM  up                    up
Serial1/0                  unassigned      YES NVRAM  administratively down down
Virtual-Access1            unassigned      YES unset  up                    up
Dialer1                    46.13.xxx.xxx   YES IPCP   up                    up