replace [username] with your iinet username and [password] with your iinet password.

hostname router
ip dhcp pool general
network 10.10.10.0 255.255.255.0
dns-server 10.10.10.1
default-router 10.10.10.1
domain-name router.local
!
ip dns server
ip domain name router.local
ip name-server 203.0.178.191
interface ATM0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
no ip mroute-cache
no atm ilmi-keepalive
!
interface ATM0.1 point-to-point
description $ES_WAN$$FW_OUTSIDE$
pvc 8/35
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
!
interface FastEthernet0
switchport access vlan 1
!
interface FastEthernet1
switchport access vlan 1
!
interface FastEthernet2
switchport access vlan 1
!
interface FastEthernet3
switchport access vlan 1
!
interface Vlan1
description --- INSIDE INTERFACE ---
ip address 10.10.10.1 255.255.255.0
ip nat inside
ip virtual-reassembly
ip tcp adjust-mss 1412
!
interface Dialer1
description --- OUTSIDE INTERFACE ---
ip address negotiated
ip mtu 1452
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap pap callin
ppp chap hostname [USERNAME]@iinet.net.au
ppp chap password password 0 [PASSWORD]
ppp pap sent-username [USERNAME]@iinet.net.au  password [PASSWORD]
!
ip access-list extended nat
permit ip 10.10.10.0 0.0.0.255 any
ip route 0.0.0.0 0.0.0.0 Dialer1
no ip http server
no ip http secure-server
ip dns server
ip nat inside source list nat interface Dialer1 overload

[facebook_ilike]

I'll post the relevant sections below

config working on IOS 12.4(24)T3

replace [username] with your TPG username and [password] with your TPG password.

hostname router
ip dhcp pool general
network 10.10.10.0 255.255.255.0
dns-server 10.10.10.1
default-router 10.10.10.1
domain-name router.local
!

ip dns server
ip domain name router.local

ip name-server 203.12.160.35
ip name-server 203.12.160.36
ip name-server 203.12.160.37

interface ATM0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
no ip mroute-cache
no atm ilmi-keepalive
!
interface ATM0.1 point-to-point
description $ES_WAN$$FW_OUTSIDE$
pvc 8/35
pppoe-client dial-pool-number 1
!
!
interface FastEthernet0
switchport access vlan 1
!
interface FastEthernet1
switchport access vlan 1
!
interface FastEthernet2
switchport access vlan 1
!
interface FastEthernet3
switchport access vlan 1
!
interface Vlan1
description --- INSIDE INTERFACE ---
ip address 10.10.10.1 255.255.255.0
ip nat inside
ip virtual-reassembly
ip tcp adjust-mss 1452
!
interface Dialer1
description --- OUTSIDE INTERFACE ---
ip address negotiated
ip mtu 1492
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication pap callin
ppp pap sent-username [USERNAME]@tpg.com.au password 0 [PASSWORD]
!
ip access-list extended nat
permit ip 10.10.10.0 0.0.0.255 any
ip route 0.0.0.0 0.0.0.0 Dialer1
no ip http server
no ip http secure-server
ip dns server
ip nat inside source list nat interface Dialer1 overload

[facebook_ilike]

Thanks Narkotix for correcting a mistake with the dns server config.