ZyXEL Communications 2WG 38.4.4 Example 4: NAT Unfriendly Application Programs

Chapter 38 Network Address Translation (NAT)

Figure 396 Example 3: Menu 15.2.1

Menu 15.2.1 - NAT	Server Setup
Default Server: 0.0.0.0		IP Address
Rule Act. Start Port End Port

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001	Yes	80	80	192.168.1.21
002	Yes	25	25	192.168.1.20
003	No	0	0	0.0.0.0
004	No	0	0	0.0.0.0
005	No	0	0	0.0.0.0
006	No	0	0	0.0.0.0
007	No	0	0	0.0.0.0
008	No	0	0	0.0.0.0
009	No	0	0	0.0.0.0
010	No	0	0	0.0.0.0
Select	Command= None			Select Rule= N/A
	Press ENTER to Confirm or ESC to Cancel:

38.4.4 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-Onemapping as port numbers do not change for Many-One-to-One(and One-to-One)NAT mapping types. The following figure illustrates this.

Figure 397 NAT Example 4

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