Wednesday, 15 May 2013

The simplest way to setup a Cisco router for Australian ADSL using PPPOA

This tutorial assumes that you are using an ISP which supports PPPOA. Bigpond and Telstra Internet Direct support this.

In this example I am configuring a Cisco 2811 with a HWIC-1ADSL WIC in Slot 0. This gives it an interface of "atm0/0/0".


interface ATM0/0/0
 description ADSL Physical Interface
 no ip address
 pvc 8/35
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
!

Next we can configure our Dialer interface. This is used to initiate authentication to your ISP.

interface Dialer0
 description ADSL Dialer Interface
 ip address negotiated
 ip nat outside
 encapsulation ppp
 dialer pool 1
 ppp authentication chap callin
 ppp chap hostname username@bigpond.com
 ppp chap password your_password
!

Now we can configure our internal LAN interface

interface FastEthernet0/0
 description LAN Interface
 ip address 192.168.0.1 255.255.255.0
 ip nat inside
 duplex auto
 speed auto
!

Create a standard ACL ready for NAT

ip access-list standard LAN
  permit 192.168.0.0 0.0.0.255
!

Allow NAT for the above ACL

ip nat inside source list LAN interface Dialer0 overload

Finally we set our default route out of the Dialer0 interface

ip route 0.0.0.0 0.0.0.0 Dialer0

Now with any luck you should have a working internet connection.

To configure DNS and DHCP services on the router please refer to my blog about enabling DHCP and DNS services.

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