VSG1435-B101 Series User’s Guide
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CHAPTER 12
Network Address Translation
(NAT)
12.1 Overview
This chapter discusses how to configure NAT on the ZyXEL Device. 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.
12.1.1 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 (Section 12.2 on page 180).
•Use the Applications screen to forward incoming service requests to the
server(s) on your local network (Section 12.3 on page 183).
•Use the Port Triggering screen to add and configure the ZyXEL Device’s
trigger port settings (Section 12.4 on page 185).
•Use the DMZ screen to configure a default server (Section 12.5 on page 189).
•Use the ALG screen to enable and disable the SIP (VoIP) ALG in the ZyXEL
Device (Section 12.6 on page 190).
•Use the Sessions screen to limit the number of concurrent NAT sessions all
clients can use (Section 12.7 on page 190).
12.1.2 What You Need To Know
Inside/Outside
Inside/outside denotes where a host is located relative to the ZyXEL Device, for
example, the computers of your subscribers are the inside hosts, while the web
servers on the Internet are the outside hosts.
