Cisco Configuration for ISDN with NAT
Example config off of an 1603 router
Current configuration:
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname USERNAME
!
logging buffered 8192 debugging
no logging console
enable secret 0 SECRETPASSWORD
!
username USERNAME password 0 PASSWORD
!
ip subnet-zero
no ip source-route
isdn switch-type basic-net3
!
interface Ethernet0
ip address 192.168.2.254 255.255.255.0
no ip directed-broadcast
no ip proxy-arp
ip nat inside
!
interface BRI0
no ip address
no ip directed-broadcast
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-net3
ppp authentication chap pap callin
no ppp multilink
!
interface Dialer1
description ISP
ip address negotiated
no ip directed-broadcast
no ip proxy-arp
ip nat outside
encapsulation ppp
no ip split-horizon
dialer remote-name rty34c
dialer idle-timeout 300
dialer string 08450798182 class DialClass
dialer string 08450798180 class DialClass
dialer hold-queue 10
dialer load-threshold 10 either
dialer pool 1
dialer-group 1
pulse-time 0
ppp authentication chap pap callin
ppp chap hostname USERNAME
ppp chap password 7 PASSWORD
ppp pap sent-username USERNAME password 7 PASSWORD
no ppp multilink
!
ip nat inside source list 18 interface Dialer1 overload
ip nat inside source static tcp 192.168.2.1 25 192.168.2.100 25 extendable
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer1
!
!
map-class dialer DialClass
access-list 18 permit 192.168.2.0 0.0.0.255
dialer-list 1 protocol ip permit
!
line con 0
exec-timeout 120 0
transport input none
line vty 0 4
access-class 12 in
password v
login
end
