Chapter 11, "Address Translation," introduced you to the different kinds of address translation and showed you how to configure basic address translation on a Cisco router. It even alluded to some of the problems you will face with address translation, such as embedding addressing information in packet payloads. This chapter focuses on some key issues with address translation and solutions to deal with these issues.
This chapter first discusses issues with embedded addresses and how the Cisco IOS can deal with these when performing address translation. Then it discusses how you can incorporate redundancy into your network when you use address translation, specifically for the address translation device. It next discusses how to perform partial address translation: Sometimes you want to do address translation, but only based on the destination address that the source is accessing. Finally, this chapter discusses a better method of implementing traffic distribution than using the ip nat commands discussed in Chapter 11.