Di seguito riporto un esempio di configurazione per router Cisco 827 con connessione Telecom Alice 7Mbit.

version 12.3
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname c827
!
boot-start-marker
boot-end-marker
!
enable secret xxxxxxxxxxxxxxxxxx
!
no aaa new-model
ip subnet-zero
no ip domain lookup
ip name-server 151.99.125.2
ip name-server 212.216.112.112
ip dhcp excluded-address 192.168.0.1 192.168.0.5
!
ip dhcp pool LAN
   network 192.168.0.0 255.255.255.0
   default-router 192.168.0.1
   dns-server 151.99.125.2 212.216.112.112
   domain-name alessandro-pensato.it
lease 0 12
!
!
interface Ethernet0
   description Interfaccia Ethernet0/0 - Lan interna
   ip address 192.168.0.1 255.255.255.0
   ip nat inside
   hold-queue 100 out
!
interface ATM0
   description Interfaccia ATM0/0 - Connessione ADSL
   no ip address
   no atm ilmi-keepalive
   pvc 8/35
       encapsulation aal5mux ppp dialer
       dialer pool-member 1
!
   dsl operating-mode ansi-dmt
   hold-queue 224 in
!
interface Dialer0
   description Interfaccia Dialer0/0 - Alice ADSL Flat 7Mega
   ip address negotiated
   ip nat outside
   encapsulation ppp
   dialer pool 1
   ppp authentication chap callin
   ppp pap sent-username aliceadsl password 7 050A0A0622494F0D0A09
!
ip nat translation timeout 420
ip nat translation tcp-timeout 120
ip nat translation pptp-timeout 420
ip nat translation icmp-timeout 1
ip nat translation max-entries 1000
ip nat inside source list 1 interface Dialer0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
!
access-list 1 permit 192.168.0.0 0.0.0.255
!
line con 0
   logging synchronous
   transport preferred all
   transport output all
   stopbits 1
line vty 0 4
   access-class 1 in
   password xxxxxxxxxxxxxxxxxx
   logging synchronous
   login
   transport preferred all
   transport input all
   transport output all
!
scheduler max-task-time 5000
!
end