Sample config: can anyone explain

Tharg

Can anyone help me with the config below. Its one we use at work and I'm trying to learn more about the inner workings of the config.

Typically we do a lot of work on small businesses with the following setup:
- A Cisco 800 (one fixed WAN IP)
- A firewall (fixed WAN IP as well and a LAN address which is the Default Gateway for the LAN)

Since we always use the same config there's not much learning going on! How do ATM0 and Dialer1 interact for example?

version 12.4
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname my_router
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$FOOi$.aBcDeFgHiJkLmNoPqRsTuVwXyZ/
!
no aaa new-model
!
resource policy
!
ip subnet-zero
!
!
ip cef
ip name-server 4.2.2.1
vpdn enable
!
bba-group pppoe global
!
interface Ethernet0
 ip address 1.2.3.4 255.255.255.252
 ip nat inside
 ip virtual-reassembly
 ip tcp adjust-mss 1452
 hold-queue 100 out
!
interface Ethernet2
 no ip address
 shutdown
 hold-queue 100 out
!
interface ATM0
 no ip address
 no atm ilmi-keepalive
 dsl operating-mode auto
 pvc 8/35
  encapsulation aal5snap
  pppoe-client dial-pool-number 1
!
interface FastEthernet1
 duplex auto
 speed auto
!
interface FastEthernet2
 duplex auto
 speed auto
!
interface FastEthernet3
 duplex auto
 speed auto
!
interface FastEthernet4
 duplex auto
 speed auto
!
interface Dialer1
 ip unnumbered Ethernet0
 encapsulation ppp
 dialer pool 1
 dialer remote-name charlie
 dialer-group 1
 ppp authentication pap chap callin
 ppp chap hostname foo
 ppp chap password 7 06041D2EDEFG80B1343
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer1
no ip http server
no ip http secure-server
!
!
access-list 10 permit any
dialer-list 1 protocol ip permit
!
control-plane
!
!
line con 0
 exec-timeout 50 0
 password 7 0832494D1B1C11
 login
 no modem enable
 stopbits 1
line aux 0
line vty 0 4
 access-class 10 in
 exec-timeout 5 0
 password 7 06150A225E4B1D
 login
 length 0
!
scheduler max-task-time 5000

techster79

It looks as though your ATM interface is plugged into a DSL circuit, since it is running PPPOE. The dialer commands would simply bring the connection up if it was idle. I might be wrong so anyone smarter than me feel free to correct.

Tharg

techster79 wrote:

It looks as though your ATM interface is plugged into a DSL circuit, since it is running PPPOE. The dialer commands would simply bring the connection up if it was idle. I might be wrong so anyone smarter than me feel free to correct.

Thanks for the reply!

Yeah, have DSL line into the router and then Ethernet connection to firewall.