Figure 30-18 Example 3: Menu 15.2; Figure 30-19 Nat Example 4 - ZyXEL Communications ZyWALL 5 User Manual

ZyWALL 5 Internet Security Appliance
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30.4.4 Example 4: NAT Unfriendly Application Programs
Some applications do not support NAT Mapping using TCP or UDP port address translation. In this
case it is better to use Many-One-to-One mapping as port numbers do not change for Many-One-
to-One (and One-to-One) NAT mapping types. The following figure illustrates this.
Other applications such as some gaming programs are NAT
unfriendly because they embed addressing information in the data
stream. These applications won't work through NAT even when
using One-to-One and Many-One-to-One mapping types.
Follow the steps outlined in example 3 above to configure these two menus as follows.
30-12
Menu 15.2 - NAT Server Setup
Start Port No. End Port No.
Default Default
80 80
25 25
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
1026 1026
Press ENTER to Confirm or ESC to Cancel:

Figure 30-18 Example 3: Menu 15.2

Figure 30-19 NAT Example 4

IP Address
0.0.0.0
192.168.1.21
192.168.1.20
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
RR Reserved
NAT