ZyXEL Communications P-661HNU - Page 196

Chapter 11 Network Address Translation (NAT)
P-661HNU-Fx User’s Guide
196
and port numbers so incoming reply packets can have their original values
restored. The following figure illustrates this.
Figure 80 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
WAN
LAN
Inside Local
Address (ILA)
Inside Global
Address (IGA)