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Implementing Carrier Grade NAT on Cisco IOS
XR Software
This chapter provides an overview of the implementation of Carrier Grade NAT on Cisco IOS XR Software.
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Carrier Grade NAT Overview and Benefits
To implement the Carrier Grade NAT, you should understand the following concepts:
Carrier Grade NAT Overview
Carrier Grade Network Address Translation (CGN) is a large scale NAT that is capable of providing private
IPv4 to public IPv4 address translation in the order of millions of translations to support a large number of
subscribers, and at least 10 Gbps full-duplex bandwidth throughput.
CGN is a workable solution to the IPv4 address completion problem, and offers a way for service provider
subscribers and content providers to implement a seamless transition to IPv6. CGN employs network address
and port translation (NAPT) methods to aggregate many private IP addresses into fewer public IPv4 addresses.
For example, a single public IPv4 address with a pool of 32 K port numbers supports 320 individual private
IP subscribers assuming each subscriber requires 100 ports. For example, each TCP connection needs one
port number.
A CGN requires IPv6 to assist with the transition from IPv4 to IPv6.
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Carrier Grade NAT Overview and Benefits, page 3
Information About Carrier Grade NAT, page 7
Cisco Carrier NAT Applications, page 14
Policy Functions, page 16
External Logging, page 21
Implementing Carrier Grade NAT on Cisco IOS XR Software, page 22
Configuration Examples for Implementing the Carrier Grade NAT, page 84
Cisco IOS XR Carrier Grade NAT Configuration Guide for the Cisco CRS Router, Release 5.2.x
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