一个以太口做Nat实例

来源： 作者： 出处：巧巧读书 2006-07-25 进入讨论组

• 关 键 词：
• access-list
• internet
• loopback
• router
• ssl

　　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#巧 巧 读 书:http://www.qqread.com/net-manage/c904174081.html进入讨论组讨论。

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