12
Network Address Translation (NAT)
12.1 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.
12.1.1What 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 12.2 on page 176).
•Use the Applications screen to forward incoming service requests to the server(s) on your local network (Section 12.3 on page 179).
•Use the Port Triggering screen to add and configure the ZyXEL Device’s trigger port settings (Section 12.4 on page 181).
•Use the DMZ screen to configure a default server (Section 12.5 on page 185).
•Use the ALG screen to enable and disable the SIP (VoIP) ALG in the ZyXEL Device (Section 12.6 on page 186).
•Use the Sessions screen to limit the number of concurrent NAT sessions all clients can use (Section 12.7 on page 186).
12.1.2What 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.
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