Figure 253 Nat Example 3; Table 167 Nat Example 3 - ZyXEL Communications ZyWALL 2Plus User Manual

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).
2 Map the second IGA to our second inside FTP server for FTP traffic in both directions (1
: 1 mapping, giving both local and global IP addresses).
3 Map the other outgoing LAN traffic to IGA3 (Many : 1 mapping).
4 You also map your third IGA to the web server and mail server on the LAN. Type Server
allows you to specify multiple servers, of different types, to other computers behind NAT
on the LAN.
The example situation looks somewhat like the following figure, in which A is the web server,
B is the mail server, C is FTP server 1 and D is FTP server 2.

Figure 253 NAT Example 3

Table 167 NAT Example 3

MAPPING RULES
FTP1
FTP2
Other LAN traffic
IGA 3
1 In this case you need to configure Address Mapping Set 1 from Menu 15.1 - Address
Mapping Sets. Therefore you must choose the Full Feature option from the Network
Address Translation field (in menu 4 or menu 11.2) in
2 Then enter 15 from the main menu.
3 Enter 1 to configure the Address Mapping Sets.
4 Enter 1 to begin configuring this new set. Enter a Set Name, choose the Edit Action and
then enter 1 for the Select Rule field. Press [ENTER] to confirm.
5 Select Type as One-to-One (direct mapping for packets going both ways), and enter the
local Start IP as 192.168.1.10 (the IP address of FTP Server 1), the global Start IP as
10.132.50.1 (our first IGA). (See
6 Repeat the previous step for rules 2 to 4 as outlined above.
Chapter 30 Network Address Translation (NAT)
IGA 1 Type 1:1
IGA 2 Type 1:1
IGA 3 Type M-1 (outgoing traffic)
Inside web server and mail server
(incoming traffic)
Figure 254 on page
Figure 255 on page 428).
ZyWALL 2 Plus User's Guide
428.
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