Linksys WRT54AG User Manual page 33

The following table shows the typical port forwarding settings for common
Internet applications.
Application External Port
FTP 21
Telnet 23
SMTP 25
DNS 53
TFTP 69
Finger 79
HTTP 80
POP3 110
NNTP 119
SNMP 116
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.
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.
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TCP UDP
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Dual-Band Wireless A/G Broadband Router
Port Triggering Port Triggering is used for special Internet applications whose
outgoing ports differ from the incoming ports. For this feature, the Router will
watch outgoing data for specific port numbers. The Router will remember the
IP address of the computer that sends a transmission requesting data, so that
when the requested data returns through the Router, the data is pulled back to
the proper computer by way of IP address and port mapping rules. Click the
Port Triggering button to set up triggered ports, and follow these instructions:
1. Enter the Application Name of the trigger (see Figure 6-27).
2. Enter the Outgoing
Port Range used by
the application.
Check with the
Internet application
for the port num-
ber(s) needed.
3. Enter the Incoming
Port Range used by
the application.
Check with the
Internet application
for the port num-
ber(s) needed.
4. Click the Apply button to save your changes. Click the Cancel button to
cancel your unsaved changes. Click the Close button to return to the Port
Forwarding screen.
To save your changes on this page, click the Apply button. To cancel any
unsaved changes on this page, click the Cancel button. To get more information
about the features, click the Help button.
Figure 6-27
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