Example 4: Nat Unfriendly Application Programs; Figure 7-21 Nat Example 4 - ZyXEL Communications PRESTIGE 650H-13 User Manual

Prestige 650H ADSL Router

7.5.4 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.
7-24
Menu 15.2.1 - 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:
Example 3: Menu 15.2.1

Figure 7-21 NAT Example 4

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
NAT