Example 4: Nat Unfriendly Application Programs; Figure 160 Nat Example 4; Figure 161 Example 4: Menu 15.1.1.1 Address Mapping Rule - ZyXEL Communications ADSL 2+ Gateway P-660HW-T1 User Manual

P-660H/HW/W-T Series User' Guide

27.5.4 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 160 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 161 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.
267
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 27 Network Address Translation (NAT)