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A02-RA141-W54 Pag. 51
Use the SUA Server 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.
The most often used port numbers are shown in the following table. Please refer
to RFC 1700 for further information about port numbers.
Services Port Number/Protocol
File Transfer Protocol (FTP) Data
20/tcp
FTP Commands
21/tcp
Telnet
23/tcp
Simple Mail Transfer Protocol (SMTP)
Email
25/tcp
Domain Name Server (DNS)
53/tcp and 53/udp
Trivial File Transfer Protocol (TFTP)
69/udp
finger
79/tcp
World Wide Web (HTTP)
80/tcp
POP3 Email
110/tcp
SUN Remote Procedure Call (RPC)
111/udp
Network News Transfer Protocol
(NNTP)
119/tcp
Network Time Protocol (NTP)
123/tcp and 123/udp
News
144/tcp
Simple Management Network Protocol
(SNMP)
161/udp
SNMP (traps)
162/udp
Border Gateway Protocol (BGP)
179/tcp
Secure HTTP (HTTPS)
443/tcp
rlogin
513/tcp
rexec
514/tcp
talk
517/tcp and 517/udp
ntalk
518/tcp and 518/udp
Open Windows
2000/tcp and 2000/udp
Network File System (NFS)
2049/tcp
X11
6000/tcp and 6000/udp
Routing Information Protocol (RIP)
520/udp