Chapter 9 Network Address Translation (Nat) - ZyXEL Communications ZyWall 10 User Manual

ZyWALL 10~100 Series Internet Security Gateway
Chapter 9
Network Address Translation (NAT)
This chapter discusses how to configure NAT on the ZyWALL.
9.1 Using NAT
You must create a firewall rule in addition to setting up SUA/NAT, to allow traffic
from the WAN to be forwarded through the ZyWALL.
9.1.1 SUA (Single User Account) Versus NAT
SUA (Single User Account) is a ZyNOS implementation of a subset of NAT that supports two types of
mapping, Many-to-One and Server. See section 9.2.1 for a detailed description of the NAT set for SUA.
The ZyWALL also supports Full Feature NAT to map multiple global IP addresses to multiple private
LAN IP addresses of clients or servers using mapping types as outlined in the Web Configurator User's
Guide.
1. Choose SUA Only if you have just one public WAN IP address for your ZyWALL.
2. Choose Full Feature if you have multiple public WAN IP addresses for your ZyWALL.
9.1.2 Applying NAT
You apply NAT via menus 4 or 11.3 as displayed next. The next figure shows you how to apply NAT for
Internet access in menu 4. Enter 4 from the main menu to go to Menu 4 - Internet Access Setup
NAT 9-1