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4 example 4: nat unfriendly application programs, Figure 163 example 3: menu 15.2 – ZyXEL Communications G-2000 Plus User Manual

Page 309

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ZyAIR G-2000 Plus User’s Guide

Chapter 28 Network Address Translation (NAT)

308

Figure 163 Example 3: Menu 15.2

Menu 15.2 - NAT Server Setup

Rule Start Port No. End Port No. IP Address
---------------------------------------------------
1. Default Default 0.0.0.0
2. 80 80 192.168.1.21
3. 25 25 192.168.1.20
4. 0 0 0.0.0.0
5. 0 0 0.0.0.0
6. 0 0 0.0.0.0
7. 0 0 0.0.0.0
8. 0 0 0.0.0.0
9. 0 0 0.0.0.0
10. 0 0 0.0.0.0
11. 0 0 0.0.0.0
12. 0 0 0.0.0.0

Press ENTER to Confirm or ESC to Cancel:

HTTP:80 FTP:21 Telnet:23 SMTP:25 POP3:110 PPTP:1723

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.