ZyXEL NBG-419N Podręcznik Użytkownika Pobierz pdf (Strona 143)

NBG-419N User’s Guide

143

CHAPTER 15

Network Address Translation

(NAT)

15.1 Overview

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 is changed to a different IP address known within

another network.

Each packet has two addresses – a source address and a destination address. For

outgoing packets, NAT maps private (local) IP addresses to globally unique ones

required for communication with hosts on other networks. It replaces the original

IP source address in each packet and then forwards it to the Internet. The NBG-

419N keeps track of the original addresses and port numbers so incoming reply

packets can have their original values restored. The following figure illustrates

this.

Figure 92 NAT Example

For more information on IP address translation, refer to RFC 1631, The IP Network

Address Translator (NAT).

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 297 298

Viktorirmg 13 Jan 2024 | 23:30:33

Cinema

ZyXEL NBG-419N Podręcznik Użytkownika Strona 143