ZyXEL Communications VMG5313-B30A Guide de l'utilisateur télécharger pdf (Page 185)

VMG1312-B Series User’s Guide 185

CHAPTER 11

Network Address Translation (NAT)

11.1 Overview

This chapter discusses how to configure NAT on the 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.

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 (Section 11.2 on page 186).

•Use the Applications screen to forward incoming service requests to the server(s) on your local

network (Section 11.3 on page 189).

•Use the Port Triggering screen to add and configure the Device’s trigger port settings (Section

11.4 on page 190).

•Use the DMZ screen to configure a default server (Section 11.5 on page 193).

•Use the ALG screen to enable and disable the NAT and SIP (VoIP) ALG in the Device (Section

11.6 on page 194).

•Use the Address Mapping screen to configure the Device's address mapping settings (Section

11.7 on page 194).

11.1.2 What You Need To Know

Inside/Outside

Inside/outside denotes where a host is located relative to the Device, 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.

NAT

In the simplest form, NAT changes the source IP address in a packet received from a subscriber

(the inside local address) to another (the inside global address) before forwarding the packet to the

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ZyXEL Communications VMG5313-B30A Guide de l'utilisateur Page 185