Cisco ASA Series Cli Configuration Manual page 747

Information About NAT
This chapter provides an overview of how Network Address Translation (NAT) works on the ASA. This
chapter includes the following sections:
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Note
To start configuring NAT, see
"Configuring Twice NAT."
Why Use NAT?
Each computer and device within an IP network is assigned a unique IP address that identifies the host.
Because of a shortage of public IPv4 addresses, most of these IP addresses are private, not routable
anywhere outside of the private company network. RFC 1918 defines the private IP addresses you can
use internally that should not be advertised:
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Why Use NAT?, page 1-1
NAT Terminology, page 1-2
NAT Types, page 1-3
NAT in Routed and Transparent Mode, page 1-10
NAT and IPv6, page 1-13
How NAT is Implemented, page 1-13
NAT Rule Order, page 1-18
Routing NAT Packets, page 1-19
NAT for VPN, page 1-22
DNS and NAT, page 1-28
Where to Go Next, page 1-33
Chapter 33, "Configuring Network Object NAT,"
10.0.0.0 through 10.255.255.255
172.16.0.0 through 172.31.255.255
192.168.0.0 through 192.168.255.255
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C H A P T E R
Cisco ASA Series CLI Configuration Guide
or Chapter 34,
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