PMG5317-T20A User’s Guide
151
CHAPTER 11
Network Address Translation (NAT)
11.1 Overview
This chapter discusses how to configure NAT on the GPON 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 152).
•Use the Applications screen to forward incoming service requests to the server(s) on your local
network (Section 11.3 on page 155).
•Use the Port Triggering screen to add and configure the GPON Device’s trigger port settings
(Section 11.4 on page 156).
•Use the DMZ screen to configure a default server (Section 11.5 on page 159).
•Use the ALG screen to enable and disable the NAT and SIP (VoIP) ALG in the GPON Device
(Section 11.6 on page 159).
•Use the Address Mapping screen to configure the GPON Device's address mapping settings
(Section 11.7 on page 160).
•Use the Sessions screen to configure the GPON Device's maximum number of NAT sessions
(Section 11.8 on page 162).
11.1.2 What You Need To Know
Inside/Outside
Inside/outside denotes where a host is located relative to the GPON 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.
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