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Telco and ISP Dial Scenarios and Configurations
PPP Calls over X.25 Networks
DNC-332
Cisco IOS Dial Services Configuration Guide: Network Services
Protocol Translation Configuration Example
In the following example, PAD callers that dial 4085551234 receive a router prompt. PAD callers that
dial 4085555123401 start PPP and pick up an address from the IP pool called dialin_pool. These
addresses are “borrowed” from the Ethernet interface on the Cisco 4500 router. Additionally, a loopback
interface network can be created and the X.25 addresses can be set. However, a routing protocol must be
run to advertise the loopback interface network if this method is used.
Note Be sure to include your own IP addresses, host names, and security passwords
where appropriate in the following examples.
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname NAS
!
aaa new-model
aaa authentication login console enable
aaa authentication login vty tacacs+
aaa authentication login dialin tacacs+
aaa authentication ppp default tacacs+
aaa authentication ppp dialin if-needed tacacs+
enable secret cisco
!
async-bootp dns-server 10.1.3.1 10.1.3.2
!
vty-async
vty-async ppp authentication chap pap
!
interface Loopback0
ip address 10.1.2.254 255.255.255.0
!
interface Ethernet0
ip address 10.1.1.10 255.255.255.0
ip summary address eigrp 10 10.1.2.0 255.255.255.0
!
interface Serial0
no ip address
encapsulation x25
x25 address 4085551234
x25 accept-reverse
x25 default pad
!
router eigrp 10
network 10.0.0.0
passive-interface Dialer0
no auto-summary
!
ip local pool dialin_pool 10.1.2.1 10.1.2.50
ip default-gateway 10.1.1.1
!
ip classless
!
translate x25 4085555123401 ppp ip-pool scope-name dialin_pool
!
dialer-list 1 protocol ip permit
!