Example 4: Nat Unfriendly Application Programs; Figure 197 Nat Example 4; Figure 198 Example 4: Menu 15.1.1.1 Address Mapping Rule - ZyXEL Communications Prestige 661H Series User Manual

Prestige 661H/HW Series User's Guide

31.5.4 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-to-Many No Overload mapping as port numbers do not
change for Many-to-Many No Overload (and One-to-One) NAT mapping types. The
following figure illustrates this.

Figure 197 NAT Example 4

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-to-Many No Overload mapping types.
Follow the steps outlined in example 3 to configure these two menus as follows.

Figure 198 Example 4: Menu 15.1.1.1 Address Mapping Rule

After you've configured your rule, you should be able to check the settings in menu 15.1.1 as
shown next.
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Menu 15.1.1.1 Address Mapping Rule
Type= Many-to-Many No Overload
Local IP:
Start= 192.168.1.10
End = 192.168.1.12
Global IP:
Start= 10.132.50.1
End = 10.132.50.3
Server Mapping Set= N/A
Press ENTER to Confirm or ESC to Cancel:
Chapter 31 Network Address Translation (NAT)