WebShare 142W
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) | 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 | 119/tcp |
| (NNTP) |
|
| Network Time Protocol (NTP) | 123/tcp and 123/udp |
| News | 144/tcp |
| Simple Management Network Protocol | 161/udp |
| (SNMP) |
|
| 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 |
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