Configuring a server behind nat, 1 configuring a server behind nat – ZyXEL Communications Prestige 650HW User Manual
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Prestige 650HW ADSL Router User’s Guide
NAT 7-15
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.
Table 7-7 Services & Port Numbers
SERVICES PORT
NUMBER
ECHO 7
FTP (File Transfer Protocol)
21
Telnet 23
SMTP (Simple Mail Transfer Protocol)
25
DNS (Domain Name System)
53
Finger 79
HTTP (Hyper Text Transfer protocol or WWW, Web)
80
POP3 (Post Office Protocol)
110
NNTP (Network News Transport Protocol)
119
SNMP (Simple Network Management Protocol)
161
SNMP trap
162
PPTP (Point-to-Point Tunneling Protocol)
1723
7.4.1 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 display Menu 15.2 - NAT Server Sets as shown next.