一个以太口做Nat实例

王朝other·作者佚名  2008-05-31
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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#

 
 
 
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