Network Address Translation (Nat); Overview; What You Can Do In This Chapter; What You Need To Know - ZyXEL Communications P-660HN-51 - V1.10 Manual

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H A P T E R
Network Address Translation

8.1 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.

8.1.1 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 ZyXEL Device's
trigger port settings
• Use the DMZ screen to configure a default server
• Use the ALG screen to enable and disable the SIP (VoIP) ALG in the ZyXEL
Device (Section 8.6 on page
• Use the Sessions screen to limit the number of concurrent NAT sessions all
clients can use

8.1.2 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.
P-660HN-51 User's Guide
(Section 8.3 on page
(Section 8.4 on page
144).
(Section 8.7 on page 144).
(NAT)
(Section 8.2 on page
137).
139).
(Section 8.5 on page
8
134).
143).
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