Configuring PAT

• Now, we want to assign a single IP address to a pool of hosts, that they can use to navigate outside of the network, PAT. The screenshot below shows an example of configuring PAT on a router. In this example, we have a number of internal PCs that want to navigate through R1 and out to the internet. However, these PCs must share a single NAT address between them, therefore we must configure PAT so that the PCs communicate through one area and share one address.

• First, like NAT, we configure our inside and outside interfaces. Next, in the pool command, we set a NAT pool for the computers to pull from. In this instance, there is only one address for them to share in the pool. On the next line, we set an access list of computers that are able to access this pool and actually use the NAT address. On the final line, we are linking the two together and saying that access-list 1 has access to the test pool of addresses.