ZyXEL Communications 5 Series - Manual (Page 627)

ZyWALL 5/35/70 Series User’s Guide
Chapter 42 Network Address Translation (NAT) 627
42.4.4 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.
Figure 375 NAT Example 4
Note: 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.
Figure 376 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.
Menu 15.1.1.1 Address Mapping Rule
Type= Many-One-to-One
Local IP:
Start= 192.168.1.10
End = 192.168.1.12
Global IP:
Start= 10.132.50.1
End = 10.132.50.3
Press ENTER to Confirm or ESC to Cancel: