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This connection use an analog modem over PSTN line as WAN link. A connection will created automatically when one of site need a communication to remote site. And disconnect automatically once meet idle times. This connection will reapeat every times communication inter site needed. Each site can initiate/create dialup connection.

Requirement:
- Cisco router with serial interface (support async mode).
- Analog modem (RS232 interface).
- Serial cable (DB60 to RS232).
- PSTN line.

ROUTER A

hostname Router-A
!
enable password cisco
!
username ciscouser1 password ciscopass
!
chat-script dial “” “atdtT” TIMEOUT 60 CONNECT c
!
interface Ethernet 0
 ip address 10.0.33.250 255.255.255.0
!
interface Serial 0 <= plug modem here
 physical-layer async
 ip address 10.0.253.30 255.255.255.252
 encapsulation ppp
 async dynamic address
 async dynamic routing
 async mode dedicated
 dialer in-band
 dialer idle-timeout 60
 dialer wait-for-carrier-time 200
 dialer map ip 10.0.253.29 name ciscouser1 modem-script dial +10218560620 <= remote number
 dialer-group 1
 peer default ip address 10.0.253.29
 ppp authentication chap pap
!
router eigrp 1
 network 10.0.0.0
!
no ip classless
ip route 10.0.2.0 255.255.255.0 10.0.253.29 150
access-list 103 deny eigrp any host 255.255.255.255
access-list 103 permit ip any any
dialer-list 1 protocol ip list 103
!
line con 0
 line 2
 exec-timeout 0 0
 modem InOut
 modem autoconfigure discovery
 speed 115200
 flowcontrol hardware
!
line vty 0 4
 password cisco
 login
!
end

===

ROUTER B

hostname Router-B
!
enable password cisco
!
username ciscouser2 password ciscopass
chat-script dial “” “atdtT” TIMEOUT 60 CONNECT c
!
interface Ethernet 0
 ip address 10.0.2.251 255.255.255.0
!
interface Serial 0 <= plug modem here
 physical-layer async
 ip address 10.0.253.29 255.255.255.252
 encapsulation ppp
 async dynamic address
 async dynamic routing
 async mode dedicated
 dialer in-band
 dialer idle-timeout 60
 dialer wait-for-carrier-time 200
 dialer map ip 10.0.253.30 name ciscouser1 modem-script dial +10218195240 <= remote number
 dialer-group 1
 peer default ip address 10.0.253.30
 ppp authentication chap pap
!
router eigrp 1
 network 10.0.0.0
!
no ip classless
ip route 10.0.33.0 255.255.255.0 10.0.253.30 150
access-list 103 deny eigrp any host 255.255.255.255
access-list 103 permit ip any any
dialer-list 1 protocol ip list 103
!
line con 0
 line 2
 exec-timeout 0 0
 modem InOut
 modem autoconfigure discovery
 speed 115200
 flowcontrol hardware
!
line vty 0 4
 password cisco
 login
!
end

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