!
interface Ethernet0
ip address 10.1.1.1 255.255.255.0
ip nat inside
no ip route-cache
no ip mroute-cache
no keepalive
!
interface Async1
ip address negotiated
ip nat outside
encapsulation ppp
no ip mroute-cache
keepalive 10
dialer in-band
dialer idle-timeout 50000
dialer string xxxxxxxxxx !your dialup number
dialer-group 5
async dynamic routing
no peer default ip address
fair-queue
ppp chap hostname xxxxxxxx !your username
ppp chap password xxxxxxxx !your password
!
ip nat inside source list 85 interface Async1 overload
access-list 85 permit 10.1.1.0 0.0.0.255
ip route 0.0.0.0 0.0.0.0 async1
This should get you pointed in the right direction
You need to configure unidirectional chap authentication. Normally cisco devices challenge each other. When dialing into an ISP you only want to challenge the dialing router.
see:
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