ZyXEL Communications ZyWall USG 2000 User Manual page 281

NAT 1:1 Policy Route
This section sets up a policy route for the traffic coming from the LAN SMTP server
to the ZyWALL's ge1 interface. It changes the source address from 192.168.1.21
to 1.1.1.1. This is also called Source NAT (SNAT). It sends the traffic out through
the ge3 interface.
Figure 172 NAT 1:1 Example Policy Route
LAN
192.168.1.21
Click Network > Routing > Policy Route > Add and configure the screen as
shown next. Be careful of where you create the route as routes are ordered in
descending priority.
Figure 173 Create a Policy Route
ZyWALL USG 2000 User's Guide
Source 192.168.1.1
NAT
SMTP
Chapter 16 Virtual Servers
Source 1.1.1.1
SMTP
281