Example 4: Nat Unfriendly Application Programs; Figure 290 Example 3: Menu 15.2.1; Figure 291 Nat Example 4 - ZyXEL Communications ZyWall 35 User Manual

ZyWALL 35 User's Guide

Figure 290 Example 3: Menu 15.2.1

Rule
------------------------------------------------------
001
002
003
004
005
006
007
008
009
010
Select Command= None

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

Figure 291 NAT Example 4

Follow the steps outlined in example 3 above to configure these two menus as follows.
484
Menu 15.2.1 - NAT Server Setup
Default Server: 0.0.0.0
Act. Start Port
Yes 80
Yes 25
No 0
No 0
No 0
No 0
No 0
No 0
No 0
No 0
Press ENTER to Confirm or ESC to Cancel:
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-One-to-One mapping
types.
End Port IP Address
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
Select Rule= N/A
Chapter 34 Network Address Translation (NAT)