Example 4: Nat Unfriendly Application Programs; Figure 182 Example 3: Menu 15.2; Figure 183 Nat Example 4 - ZyXEL Communications P-335WT User Manual

P-335 Series User's Guide

Figure 182 Example 3: Menu 15.2

29.5.4 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.

Figure 183 NAT Example 4

Follow the steps outlined in example 3 to configure these two menus as follows
330
Menu 15.2 - NAT Server Setup
Rule Start Port No.
---------------------------------------------------
1. Default
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Press ENTER to Confirm or ESC to Cancel:
HTTP:80 FTP:21 Telnet:23 SMTP:25 POP3:110 PPTP:1723
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-to-Many No Overload
mapping types.
End Port No.
Default
80 80
25 25
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
Chapter 29 Network Address Translation (NAT)
IP Address
0.0.0.0
192.168.1.21
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