In this chapter, we covered NAT, the reasons it was implemented, and the issues that it raises. We also covered both Static NAT, or 1:1 NAT, and Dynamic NAT, which covers both Outbound NAT and Port Forwarding. Although understanding all of these types of NAT are key to a thorough understanding of the technology, we also acknowledged that Port Forwarding is most commonly equated with NAT, and is probably the most likely form of NAT you will utilize. We also covered NPt, which is a rarely used method of mapping IPv6 public addresses to IPv6 private addresses, but does have its applications, particularly with multihoming.

Understanding this chapter is important, as we will return to NAT in subsequent chapters. For example, in Chapter 7, Virtual Private Networks (VPNs), we will use Outbound NAT to redirect traffic when setting up VPN tunnels. At the very least, you will want...