Linksys WRT51AB manual Applications External Port TCP Protocol UDP Protocol, Port Forwarding

Instant Wireless® Series

Port Forwarding

The Port Forwarding screen sets up public services on your network, such as web servers, ftp servers, e-mail servers, or other specialized Internet applica- tions. (Specialized Internet applications are any applications that use Internet access to perform functions such as videoconferencing or online gaming. Some Internet applications may not require any forwarding.)

Figure 6-24

Note: Any PC whose port is being forwarded should have its DHCP client function disabled and a new static IP address assigned to it because its IP address may change when using the DHCP function.

Customized Applications In the field provided, enter the name you wish to give each application.

External Port For each application, enter the number of the External Ports (the port numbers seen by users on the Internet) in the appropriate fields. (To find out the port range, check your application’s documentation.) If there is only one External Port, enter its number in both External Port fields.

Dual-Band Wireless A+B Broadband Router

TCP Protocol Click this checkbox if you want to forward the data transmis- sions that use the TCP protocol.

UDP Protocol Click this checkbox if you want to forward the data transmis- sions that use the UDP protocol.

IP Address For each application, enter the IP Address of the PC running the specific application.

Enable Click the Enable checkbox to enable port forwarding for the relevant application.

The following table shows the typical port forwarding settings for common Internet applications.

Applications	External Port	TCP Protocol	UDP Protocol
FTP	21
Telnet	23
SMTP	25	÷
DNS	53		÷
TFTP	69
Finger	79
HTTP	80
POP3	110
NNTP	119	÷
SNMP	161		÷

To apply any of the settings you change on this page, click the Apply button. To cancel any changes you’ve entered on this page, click the Cancel button. To get more information about the features, click the Help button.

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