Example 2: Internet Access With A Default Server; Example 3: Multiple Public Ip Addresses With Inside Servers; Figure 336 Nat Example 2; Figure 337 Menu 15.2: Specifying An Inside Server - ZyXEL Communications ZYWALL 2 PLUS User Manual

Chapter 35 Network Address Translation (NAT)

35.4.2 Example 2: Internet Access with a Default Server

Figure 336 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 337 Menu 15.2: Specifying an Inside Server

35.4.3 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).
510
Menu 15.2 - NAT Server Setup
Default Server: 192.168.1.10
Rule Act. Start Port
------------------------------------------------------
001 No 0
002 Yes 21
003 No 0
004 No 0
005 No 0
006 No 0
007 No 0
008 No 0
009 No 0
010 No 0
Select Command= None
Press ENTER to Confirm or ESC to Cancel:
End Port IP Address
0 0.0.0.0
25 192.168.1.33
0 0.0.0.0
0 0.0.0.0
0 0.0.0.0
0 0.0.0.0
0 0.0.0.0
0 0.0.0.0
0 0.0.0.0
0 0.0.0.0
Select Rule= N/A
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