Example 4: Nat Unfriendly Application Programs; Figure 187 Example 3: Menu 15.2; Figure 188 Nat Example 4 - ZyXEL Communications P-334WT User Manual

Figure 187 Example 3: Menu 15.2

28.5.4 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 188 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-
to-Many No Overload mapping types.
Follow the steps outlined in example 3 to configure these two menus as follows
Chapter 28 Network Address Translation (NAT)
Menu 15.2 - NAT Server Setup
Rule Start Port No.
---------------------------------------------------
1. Default
2. 80
3. 25
4. 0
5. 0
6. 0
7. 0
8. 0
9. 0
10. 0
11. 0
12. 0
Press ENTER to Confirm or ESC to Cancel:
HTTP:80 FTP:21 Telnet:23 SMTP:25 POP3:110 PPTP:1723
End Port No. IP Address
Default 0.0.0.0
80 192.168.1.21
25 192.168.1.20
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 0.0.0.0
0 0.0.0.0
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