interface Loopback0 
ip address 10.0.1.1 255.255.255.252 
ip nat outside 
!--- Creates a virtual interface called Loopback 0 and assigns an 
!--- IP address of 10.0.1.1 to it. Defines interface Loopback 0 as 
!--- NAT outside. 
! 
! 
interface Ethernet0 
ip address 192.168.1.2 255.255.255.0 secondary 
ip address 10.0.0.2 255.255.255.0 
ip Nat inside 
!--- Assigns a primary IP address of 10.0.0.2 and a secondary IP 
!--- address of 192.168.1.2 to Ethernet 0. Defines interface Ethernet 0 
!--- as NAT inside. The 192.168.1.2 address will be used to communicate 
!--- through the CM to the CMTS and the Internet. The 10.0.0.2 address 
!--- will be used to communicate with the local hosts. 
 
ip policy route-map Nat-loop 
!--- Assigns route-map "Nat-loop" to Ethernet 0 for policy routing. 
! 
ip Nat pool external 192.168.2.2 192.168.2.3 prefix-length 29 
ip Nat inside source list 10 pool external overload 
ip Nat inside source static 10.0.0.12 192.168.2.1 
!--- NAT is defined: packets matching access-list 10 will be 
!--- translated to an address from the pool called "external". 
!--- A static NAT translation is defined for 10.0.0.12 to be 
!--- translated to 192.168.2.1 (this is for host 2 which needs 
!--- to be accessed from the Internet). 
 
ip classless 
! 
! 
ip route 0.0.0.0 0.0.0.0 192.168.1.1 
ip route 192.168.2.0 255.255.255.0 Ethernet0 
!--- Static default route set as 192.168.1.1, also a static 
!--- route for network 192.168.2.0/24 directly attached to 
!--- Ethernet 0 
! 
! 
access-list 10 permit 10.0.0.0 0.0.0.255 
!--- Access-list 10 defined for use by NAT statement above. 
 
access-list 102 permit ip any 192.168.2.0 0.0.0.255 
access-list 102 permit ip 10.0.0.0 0.0.0.255 any 
!--- Access-list 102 defined and used by route-map "Nat-loop" 
!--- which is used for policy routing. 
! 
Access-list 177 permit icmp any any 
!--- Access-list 177 used for debug. 
! 
route-map Nat-loop permit 10 
match ip address 102 
set ip next-hop 10.0.1.2 
!--- Creates route-map "Nat-loop" used for policy routing. 
!--- Route map states that any packets matching access-list 102 will 
!--- have the next hop set to 10.0.1.2 and be routed "out" the 
!--- loopback interface. All other packets will be routed normally. 
! 
end 
NAT-router#

本文转自loveme2351CTO博客，原文链接： http://blog.51cto.com/loveme23/8005，如需转载请自行联系原作者