ZyXEL P-870H-53A v2 User Guide - Page 117
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 ZyXEL Device. 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 this Chapter • The Port Forwarding screen lets you configure forward incoming service requests to the server(s) on your local network (Section 8.3 on page 118). • The Address Mapping screen lets you configure the ZyXEL Device's address mapping settings (Section 8.4 on page 121). • The Trigger Port screen lets you change the ZyXEL Device's trigger port settings (Section 8.5 on page 124). • The DMZ Host screen lets you configure a default server (Section 8.6 on page 128). • The ALG screen lets you enable SIP ALG on the ZyXEL Device (Section 8.7 on page 128). 8.2 What You Need to Know The following terms and concepts may help as you read through this chapter. NAT In the simplest form, NAT changes the source IP address in a packet received from a subscriber (the inside local address) to another (the inside global address) before forwarding the packet to the WAN side. When the response comes back, P-870H/HW Series User's Guide 117