ZyXEL Communications p-2612HNU-FX User Manual

Chapter 8 Network Address Translation (NAT)

P-2612HNU-Fx User’s Guide

and port numbers so incoming reply packets can have their original values 
restored. The following figure illustrates this.

Figure 47   How NAT Works

192.168.1.13

192.168.1.10

192.168.1.11

192.168.1.12

SA

192.168.1.10

SA

IGA1

Inside Local
IP Address

192.168.1.10
192.168.1.11
192.168.1.12
192.168.1.13

Inside Global 
IP Address
IGA 1
IGA 2
IGA 3
IGA 4

NAT Table

Inside Local
Address (ILA)

Inside Global
Address (IGA)