Telco and ISP Dial Scenarios and Configurations
PPP Calls over X.25 Networks
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
no service
!
hostname NAS
!
aaa
aaaauthentication login console enable aaa authentication login vty tacacs+ aaa authentication login dialin tacacs+ aaa authentication ppp default tacacs+
aaa authentication ppp dialin
!
!
!
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
x25 default pad
!
router eigrp 10 network 10.0.0.0
!
ip local pool dialin_pool 10.1.2.1 10.1.2.50 ip
!
ip classless
!
translate x25 4085555123401 ppp
!
!
Cisco IOS Dial Services Configuration Guide: Network Services
