NXC Series User’s Guide
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CHAPTER 12
NAT
12.1 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. Use Network Address Translation (NAT) to make
computers on a private network behind the NXC available outside the private network. If the NXC has
only one public IP address, you can make the computers in the private network available by using ports
to forward packets to the appropriate private IP address.
Suppose 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 and the ISP assigns the WAN IP address. The NAT network
appears as a single host on the Internet.
Figure 100 Multiple Servers Behind NAT Example
12.1.1 What You Can Do in this Chapter
The NAT screens (see Section 12.2 on page 189) display and manage the list of NAT rules and see their
configuration details. You can also create new NAT rules and edit or delete existing ones.
12.2 NAT Summary
The NAT summary screen provides a summary of all NAT rules and their configuration. In addition, this
screen allows you to create new NAT rules and edit and delete existing NAT rules. To access this screen,
log into the Web Configurator and click Configuration > Network > NAT. The following screen appears,
providing a summary of the existing NAT rules.
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