ZyXEL Communications P-2812HNU-51c User Manual page 195

Device 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 86 How NAT Works
LAN
192.168.1.12
192.168.1.11
P-2812HNU(L)-Fx Series User's Guide
192.168.1.13
SA
192.168.1.10
Inside Local
Address (ILA)
192.168.1.10
Chapter 10 Network Address Translation (NAT)
NAT Table
Inside Local Inside Global
IP Address
IP Address
192.168.1.10
IGA 1
192.168.1.11
IGA 2
192.168.1.12
IGA 3
192.168.1.13
IGA 4
SA
IGA1
Inside Global
Address (IGA)
WAN
195