Chapter 23. NAT

This chapter provides information and commands concerning the following topics:

• Configuring dynamic NAT

• Configuring PAT

• Configuring static NAT

• Verifying NAT and PAT configuration

• Troubleshooting NAT and PAT configuration

The following table lists the address ranges as specified in RFC 1918 that can be used by anyone as internal private addresses. These will be your "inside-the-LAN" addresses that will have to be translated into public addresses that can be routed across the Internet. Any network is allowed to use these addresses; however, these addresses are not allowed to be routed onto the public Internet.

Private Addresses
Class	RFC 1918 Internal Address Range	CIDR Prefix
A	10.0.0.010.255.255.255	10.0.0.0/8
B	172.16.0.0172.31.255.255	172.16.0.0/12
C	192.168.0.0192.168.255.255	192.168.0.0/16