Configuring NAT
The first step in configuring NAT is to designate the inside and outside interfaces. Beyond that, the configuration depends on whether you are configuring static NAT or dynamic NAT. For static NAT, you just create the appropriate mapping entries in the NAT table. For dynamic NAT, you create a pool of addresses to be used in the translation and create access lists to identify the addresses to be translated. A single command then ties the pool and the access leist together.
This section demonstrates the most common configuration techniques for NAT in its most common uses.
In Figure 4-15, the inside network is addressed out of the 10.0.0.0 address space. Two of the devices, hosts A and C, must be able to communicate with the outside world. Those two devices are translated to the public addresses 204.15.87.1/24 and 204.15.87.2/24.
Example 4-4 shows the configuration to implement NAT at Mazatlan.
F
igure 4-15 The Inside Local Addresses of Devices A and C Are Statically Translated to Inside Global Addresses by the NAT Process in Router Mazatlan
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