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How to configure PPPoE on Cisco router


Cisco 851. CiscoIOS version 12.4.

PPPoE dial-up. NAT on PPP interface

show conf 
vpdn-group 1
  protocol pppoe
 l2tp tunnel receive-window 128
ip route Dialer1 permanent
ip nat inside source list 101 interface Dialer1 overload
interface Dialer1
 ip address negotiated
 ip mtu 1492
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 ip tcp adjust-mss 1452
 no ip mroute-cache
 dialer pool 1
 dialer-group 1
 no keepalive
 no cdp enable
 ppp authentication chap callin
 ppp chap hostname USERNAME
 ppp chap password 7 ENCRYPTEDPASSWORD
 ppp pap sent-username USERNAME password 7 ENCRYPTEDPASSWORD
 no ppp pap wait
 ppp ipcp dns request
interface FastEthernet4
 no ip address
 ip virtual-reassembly
 duplex auto
 speed auto
 pppoe enable group 1
 pppoe-client dial-pool-number 1
interface Vlan1
 ip address
 ip nat inside
 ip virtual-reassembly
 ip tcp adjust-mss 1452
access-list 101 permit ip any