Figure 31-19 Nat Example 4 - ZyXEL Communications Prestige 662HW Series User Manual

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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.
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.
Network Address Translation (NAT)
Menu 15.2.1 - NAT Server Setup
Start Port No.
Default
80
25
0
0
0
0
0
0
0
0
0
Press ENTER to Confirm or ESC to Cancel:
Example 3: Menu 15.2.1

Figure 31-19 NAT Example 4

Prestige 662HW Series User's Guide
End Port No. IP Address
Default
80
25
0
0
0
0
0
0
0
0
0
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
0.0.0.0
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