Router_A(config)#interface dialer 1
Router_A(config-if)#ip address negotiated
Router_A(config-if)#ip mtu 1454
Router_A(config-if)#ip access-group 100 in
Router_A(config-if)#ip nat outside
Router_A(config-if)#dialer pool 1
Router_A(config-if)#dialer idle-timeout 0
Router_A(config-if)#dialer-group 1
Router_A(config-if)#encapsulation ppp
Router_A(config-if)#ppp authentication chap callin
Router_A(config-if)#ppp chap hostname client1
Router_A(config-if)#ppp chap password cisco
Router_A(config-if)#no shutdown