Configuring Inside Global Address Overloading or PAT
The following procedure configures inside global address overloading:
Step 1 At a minimum, IP routing and appropriate IP addresses must be configured on the router.
Step 2 Configure dynamic address translation, as described in the "Configuring NAT for Basic Local IP Address Translation" section earlier in this appendix.
When you define the mapping between the access list and the IP NAT pool, add the overload keyword to the command:
Router(config)#ip nat inside source list access-list-number pool name overload
Alternatively, the address of an interface on the router can be used as the address to which the inside local addresses will be translated, using the following command:
Router(config)#ip nat inside source list access-list-number interface interface-name overload
Step 3 Enable NAT on the appropriate interfaces with the following command:
Routen(config-if)#ip nat {inside | outside}
Example D-2 shows a sample configuration of inside global address overloading. This example uses a pool of addresses named net-172 to translate inside local addresses 10.1.1.x to inside global addresses 172.16.2.x. Inside global addresses are overloaded.
Example D-2 Example of Inside Global Address Overloading ip nat pool net-172 172.16.2.1 172.16.2.254 netmask 255.255.255.0
ip nat inside source list 1 pool net-172 overload
interface Serial0
ip address 172.30.232.182 255.255.255.240 ip nat outside
interface Ethernet0
ip address 10.1.1.254 255.255.255.0 ip nat inside
access-list 1 permit 10.1.1.0 0.0.0.255
Continue reading here: Clearing NAT Translation Entries
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