ZyXEL Communications NWD-210N - FOR MAC V1.00 Guide de l'utilisateur télécharger pdf (Page 103)

NBG5715 User’s Guide 103

CHAPTER 14

NAT

14.1 Overview

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.

The figure below is a simple illustration of a NAT network. You want to assign ports 21-25 to one

FTP, Telnet and SMTP server (A in the example), port 80 to another (B in the example) and assign

a default server IP address of 192.168.1.35 to a third (C in the example).

You assign the LAN IP addresses to the devices (A to D) connected to your NBG5715. The ISP

assigns the WAN IP address. The NAT network appears as a single host on the Internet. All traffic

coming from A to D going out to the Internet use the IP address of the NBG5715, which is

192.168.1.1.

Figure 60 NAT Example

This chapter discusses how to configure NAT on the NBG5715.

Note: You must create a firewall rule in addition to setting up NAT, to allow traffic from

the WAN to be forwarded through the NBG5715.

14.1.1 What You Can Do in this Chapter

•Use the General screen to enable NAT and set a default server (Section 14.2 on page 105).

•Use the Port Forwarding screen to forward incoming service requests to the server(s) on your

local network (Section 14.3 on page 106).

A: 192.168.1.33

B: 192.168.1.34

C: 192.168.1.35

IP address

192.168.1.1

WANLAN

assigned by ISP

FTP, Telnet, SNMP

Port 80

Ports 21 to 25

1 2 ... 98 99 100 101 102 103 104 105 106 107 108 ... 291 292

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ZyXEL Communications NWD-210N - FOR MAC V1.00 Guide de l'utilisateur Page 103