Atlantis Land A02-RA144-W300N - Manual (Page 63)

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7.3.1 Port Forwarding: Services and Port Numbers
A NAT 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 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