ZyXEL Communications ADSL 2+ Security Gateway, User Manual, Page: 532 / 686

Chapter 36 Network Address Translation (NAT)
ZyWALL 2 Plus User’s Guide
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36.4.2 Example 2: Internet Access with a Default Server
Figure 354 NAT Example 2
In this case, you do exactly as above (use the convenient pre-configured
SUA Only
set) and
also go to menu 15.2 to specify the Default Server behind the NAT as shown in the next
figure.
Figure 355 Menu 15.2: Specifying an Inside Server
36.4.3 Example 3: Multiple Public IP Addresses With Inside Servers
In this example, there are 3 IGAs from our ISP. There are many departments but two have
their own FTP server. All departments share the same router. The example will reserve one
IGA for each department with an FTP server and all departments use the other IGA. Map the
FTP servers to the first two IGAs and the other LAN traffic to the remaining IGA. Map the
third IGA to an inside web server and mail server. Four rules need to be configured, two bi-
directional and two uni-directional as follows.
1 Map the first IGA to the first inside FTP server for FTP traffic in both directions ( 1 : 1
mapping, giving both local and global IP addresses).
Menu 15.2 - NAT Server Setup
Default Server: 192.168.1.10
Rule Act. Start Port End Port IP Address
------------------------------------------------------
001 No 0 0 0.0.0.0
002 Yes 21 25 192.168.1.33
003 No 0 0 0.0.0.0
004 No 0 0 0.0.0.0
005 No 0 0 0.0.0.0
006 No 0 0 0.0.0.0
007 No 0 0 0.0.0.0
008 No 0 0 0.0.0.0
009 No 0 0 0.0.0.0
010 No 0 0 0.0.0.0
Select Command= None Select Rule= N/A
Press ENTER to Confirm or ESC to Cancel: