Configuring Servers Behind Sua (Example); General Nat Screen; Figure 66 Multiple Servers Behind Nat Example; Table 55 Services And Port Numbers - ZyXEL Communications P-334WT User Manual

P-334WT User's Guide
The most often used port numbers are shown in the following table. Please refer to RFC 1700
for further information about port numbers. Please also refer to the Supporting CD for more
examples and details on SUA/NAT.

Table 55 Services and Port Numbers

SERVICES
ECHO
FTP (File Transfer Protocol)
SMTP (Simple Mail Transfer Protocol)
DNS (Domain Name System)
Finger
HTTP (Hyper Text Transfer protocol or WWW, Web)
POP3 (Post Office Protocol)
NNTP (Network News Transport Protocol)
SNMP (Simple Network Management Protocol)
SNMP trap
PPTP (Point-to-Point Tunneling Protocol)

8.3.3 Configuring Servers Behind SUA (Example)

Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (A in the
example), port 80 to another (B in the example) and assign a default server IP address of
192.168.1.35 to a third (C in the example). You assign the LAN IP addresses and the ISP
assigns the WAN IP address. The NAT network appears as a single host on the Internet

Figure 66 Multiple Servers Behind NAT Example

8.4 General NAT Screen

Click the NAT link under Network to open the General screen.
140
PORT NUMBER
7
21
25
53
79
80
110
119
161
162
1723
Chapter 8 Network Address Translation (NAT)