!
hostname Router_A
!
enable password cisco
!
ip subnet-zero
!
interface Serial0
ip address 10.1.1.1 255.255.255.0
ip nat outside
clockrate 64000
!
interface FastEthernet0
ip address 172.16.1.1 255.255.0.0
ip nat inside
speed auto
!
ip nat inside source list 1 interface Serial0 overload
ip classless
!
access-list 1 permit 172.16.1.0 0.0.0.255
!
line vty 0 4
password cisco
login
!
end