ZyXEL P-870MH-C1 User Guide - Page 147
Network Address Translation (NAT), 8.1 Overview, 8.1.1 What You Can Do in this What
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CHAPTER 8 Network Address Translation (NAT) 8.1 Overview This chapter discusses how to configure NAT on the 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 148). • The Trigger Port screen lets you change the Device's trigger port settings (Section 8.4 on page 151). • The DMZ Host screen lets you configure a default server (Section 8.5 on page 156). • The ALG screen lets you enable SIP ALG on the Device (Section 8.6 on page 156). 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, NAT translates the destination address (the inside global address) back to the inside local address before forwarding it to the original inside host. P-870HN-5xb User's Guide 147