Configuring A Server Behind Nat; Table 6-7 Services & Port Numbers - ZyXEL Communications Prestige 310 User Manual

Many residential broadband ISP accounts do not allow you to run any server
processes (such as a Web or FTP server) from your location. Your ISP may
periodically check for servers and may suspend your account if it discovers any
active services at your location. If you are unsure, refer to your ISP.
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 included disk for more examples and details on
NAT.
ECHO
FTP (File Transfer Protocol)
Telnet
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)

6.4.1 Configuring a Server behind NAT

Follow these steps to configure a server behind NAT:
Step 1. Enter 15 in the main menu to go to Menu 15 — NAT Setup.
Step 2. Enter 2 to go to Menu 15.2 — NAT Server Setup.
Step 3. Enter a port number in an unused Start Port No field. To forward only one port, enter it again in
the End Port No field. To specify a range of ports, enter the last port to be forwarded in the End
Port No field.
Step 4.
Enter the inside IP address of the server in the IP Address field. In the following figure, you have
a computer acting as an FTP, Telnet and SMTP server (ports 21, 23 and 25) at 192.168.1.33.
Network Address Translation (NAT)
Table 6-7 Services & Port Numbers
SERVICES
Prestige 310 Broadband Sharing Gateway
PORT NUMBER
7
21
23
25
53
79
80
110
119
161
162
1723
6-13