Port Forwarding: Services And Port Numbers; Table 41 Services And Port Numbers - ZyXEL Communications P-320W User Manual

802.11g wireless firewall router
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P-320W User's Guide
Note: If you do not assign a Default Server IP Address, the Prestige discards all
packets received for ports that are not specified in this screen or remote
management.

8.1.6 Port Forwarding: Services and Port Numbers

A SUA server set is a list of inside (behind NAT on the LAN) servers, for example, web or
FTP, that you can make accessible to the outside world even though NAT makes your whole
inside network appear as a single machine to the outside world.
Use the Port Forwarding page to forward incoming service requests to the server(s) on your
local network. You may enter a single port number or a range of port numbers to be
forwarded, and the local IP address of the desired server. The port number identifies a service;
for example, web service is on port 80 and FTP on port 21. In some cases, such as for
unknown services or where one server can support more than one service (for example both
FTP and web service), it might be better to specify a range of port numbers.
In addition to the servers for specified services, NAT supports a default server. A service
request that does not have a server explicitly designated for it is forwarded to the default
server. If the default is not defined, the service request is simply discarded.
Note: 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 Supporting CD for more
examples and details on SUA/NAT.

Table 41 Services and Port Numbers

SERVICE
ECHO
SMTP (Simple Mail Transfer Protocol)
NNTP (Network News Transport Protocol)
SNMP trap
PPTP (Point-to-Point Tunneling Protocol)
102
PORT NUMBER
7
21
25
53
79
80
110
119
161
162
1723
Chapter 8 Network Address Translation (NAT)

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