ZyXEL P-792H v2 User Guide - Page 101
Network Address Translation
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CHAPTER 8 Network Address Translation (NAT) 8.1 Overview This chapter discusses how to configure NAT on the P-792H v2. 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. 8.1.1 What You Can Do in the NAT Screens • Use the General screen (Section 8.2 on page 103) to configure the NAT setup settings. • Use the Port Forwarding screen (Section 8.3 on page 104) to configure forward incoming service requests to the server(s) on your local network. • Use the Address Mapping screen (Section 8.4 on page 107) to change your P792H v2's address mapping settings. • Use the ALG screen (Section 8.5 on page 111) to enable and disable the SIP (VoIP) ALG in the P-792H v2. 8.1.2 What You Need To Know About NAT Inside/Outside Inside/outside denotes where a host is located relative to the P-792H v2, 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. P-792H v2 User's Guide 101