EMG6726/8726-B10A User’s Guide
153
C
H A P T E R
11
Network Address Translation
(NAT)
11.1 Overview
This chapter discusses how to configure NAT on the EMG. 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 to a different IP address known within another network.
11.1.1 What You Can Do in this Chapter
• Use the
Port Forwarding
screen to configure forward incoming service requests to the server(s) on your
local network (
• Use the
Applications
screen to forward incoming service requests to the server(s) on your local
network (
• Use the
Port Triggering
screen to add and configure the EMG’s trigger port settings (
).
• Use the
DMZ
screen to configure a default server (
• Use the
ALG
screen to enable and disable the NAT and SIP (VoIP) ALG in the EMG (
).
• Use the
Address Mapping
screen to configure the EMG's address mapping settings (
).
• Use the
Sessions
screen to configure the EMG's maximum number of NAT sessions (
).
11.1.2 What You Need To Know
Inside/Outside
Inside/outside denotes where a host is located relative to the EMG, for example, the computers of your
subscribers are the inside hosts, while the web servers on the Internet are the outside hosts.
Global/Local
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.
