Chapter 7 Network Address Translation (Nat) Screens; Nat Overview; Table 7-1 Nat Definitions - Nortel Contivity 221 User Manual

Chapter 7
Network Address Translation (NAT) Screens

NAT Overview

7.1
NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a host
in a packet. For example, the source address of an outgoing packet, used within one network is
changed to a different IP address known within another network.
7.1.1 NAT Definitions
Inside/outside denotes where a host is located relative to the Contivity 221. For example, the
computers of your subscribers are the inside hosts, while the web servers on the Internet are the
outside hosts.
Global/local denotes the IP address of a host in a packet as the packet traverses a router. For
example, the local address refers to the IP address of a host when the packet is in the local network,
while the global address refers to the IP address of the host when the same packet is traveling in the
WAN side.
Note that inside/outside refers to the location of a host, while global/local refers to the IP address of
a host used in a packet. Thus, an inside local address (ILA) is the IP address of an inside host in a
packet when the packet is still in the local network, while an inside global address (IGA) is the IP
address of the same inside host when the packet is on the WAN side. The following table
summarizes this information.

Table 7-1 NAT Definitions

TERM
Inside This refers to the host on the LAN.
Outside This refers to the host on the WAN.
Local This refers to the packet address (source or destination) as the packet travels on the LAN.
Global This refers to the packet address (source or destination) as the packet travels on the WAN.
This chapter discusses how to configure NAT on the Contivity 221.
DESCRIPTION
Contivity 221 VPN Switch User's Guide
7-1