ADSL configuration on Cisco router



PPPoA  with  Cisco 1700+ WIC-1ADSL

I have configured following with Cisco 1700 series router which includes  WIC-1ADSL Card. Please make sure the IOS is latest than 12.2

Configure ATM interface with the PVC number, DSL Mode , encapsulation and dialer pool

interface ATM0
 no ip address
 no atm ilmi-keepalive
 dsl operating-mode auto
 pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1

In here please check the dsl operating mode and encapsulation with your ISP. Most probably dsl operating mode  will works with auto. But you should  have to check the encapsulation  with ISP[aal5snap/ aal5mux]. BT(United Kingdom) use aal5mux.
After that you have to configure the dialler interface with ADSL username and password accordingly

PPPoA with Dynamic IP
interface Dialer1
 ip address negotiated
 ip nat outside
 encapsulation ppp
 dialer pool 1
 ppp chap hostname AccountNAME.btclick.com
 ppp chap password 0 PASSWORD_FOR_ACCOUNT
 ppp pap sent-username AccountNAME.btclick.com password 0 PASSWORD_FOR_ACCOUNT

(Please Note that this AccountNAME.btclick.com and PASSWORD_FOR_ACCOUNT is supplied with your ADSL account details)

With Dynamic IP configuration you have to configure NAT with your router. You have to assign your public IP to LAN interface
Ex:
interface FastEthernet0
 ip address 1.1.1.1 255.255.255.248 (replace with your public IP and Subnet mask)
 ip nat inside

NAT Configuration and default route example
ip nat pool isppool 1.1.1.1  1.1.1.255 netmask 255.255.255.0
ip nat inside source list 1 interface Dialer1 overload
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer1

PPPoA with Static IP

interface Dialer1
 ip address 1.1.1.1 255.255.255.248 (replace with your public IP and Subnet mask)
encapsulation ppp
 dialer pool 1
 ppp chap hostname AccountNAME.btclick.com
 ppp chap password 0 PASSWORD_FOR_ACCOUNT
 ppp pap sent-username AccountNAME.btclick.com password 0 PASSWORD_FOR_ACCOUNT

Optionally configure service timestamp to properly log and display debug output in the troubleshooting section. Issue followings in global configuration mode
Router(config)#service timestamps debug datetime msec
Router(config)#service timestamps log datetime msec

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