ZyXEL Communications ZyWALL5UTM 4.0 User Manual

ZyWALL 5/35/70 Series User’s Guide

Chapter 42 Network Address Translation (NAT)

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Figure 323 Menu 15.2.1: NAT Server Setup

Menu 15.2.1 - NAT Server Setup

         Default Server: 0.0.0.0
       Rule Act. Start Port End Port IP Address
      ------------------------------------------------------
       001 No 0       0    0.0.0.0
       002 Yes 21     25     192.168.1.33
       003 No 0       0    0.0.0.0
       004 No 0       0    0.0.0.0
       005 No 0       0    0.0.0.0
       006 No 0       0    0.0.0.0
       007 No 0       0    0.0.0.0
       008 No 0       0    0.0.0.0
       009 No 0       0    0.0.0.0
       010 No 0       0    0.0.0.0

Select Command= None Select Rule= N/A
Press ENTER to Confirm or ESC to Cancel:

You assign the private network IP addresses. The NAT network appears as a single host on the
Internet. A is the FTP/Telnet/SMTP server.

Figure 324 Server Behind NAT Example

42.4 General NAT Examples

The following are some examples of NAT configuration.

42.4.1 Internet Access Only

In the following Internet access example, you only need one rule where all your ILAs (Inside
Local addresses) map to one dynamic IGA (Inside Global Address) assigned by your ISP.