Two solutions to this
dilemma are Network Address Translation (NAT) and IP version 6 (IPv6).
NAT provides a short-term solution to this problem by translating private IPv4 addresses
into globally unique, routable IPv4 addresses. IPv6 is the long-term solution. By increasing
the size of an IP address to 128 bits, IPv6 increases the total number of addresses that are
available. This chapter discusses both solutions.
Chapter Objectives
Upon completing this chapter, you will be able to describe when to use NAT or Port Address
Translation (PAT) on a medium-sized network and con?¬?gure NAT or PAT on routers. You
will also be able to explain IPv6 addressing and con?¬?gure IPv6 in a Cisco router. This
ability includes being able to meet these objectives:
?– Con?¬?gure and verify static, dynamic, and overloading NAT and identify key show and
debug command parameters that are required for troubleshooting NAT and PAT
?– Explain the format of IPv6 addresses and the components that are required to run IPv6,
con?¬?gure IPv6 capability with RIP, and explain the impact that IPv6 has on network
routing
Scaling the Network with NAT and PAT
Two Internet scalability challenges are the depletion of registered IP version 4 (IPv4)
address space and scaling in routing.
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