interface Loopback0
ip address xxx.xxx.xxx.xxx 255.255.255.240
interface Ethernet0/0
ip address xxx.xxx.xxx.xxx 255.255.255.240
ip nat inside
no ip route-cache
no ip mroute-cache
load-interval 30
half-duplex
no cdp enable
ip nat inside source list 5 interface Loopback0 overload
access-list 5 permit 10.57.0.0
access-list 5 permit 10.79.0.0
access-list 5 permit 192.168.0.0
access-list 5 permit 10.57.0.0 0.0.255.255
access-list 5 permit 10.79.0.0 0.0.255.255
access-list 5 permit 192.168.0.0 0.0.255.255