ZyXEL Communications 792H manual Example 4 NAT Unfriendly Application Programs, Example 3- Menu

Prestige 791R G.SHDSL Router

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:

Figure 27-19 Example 3- Menu 15.2

27.4.4 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-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 27-20 NAT Example 4

27-18 NAT