Netgear D6300 사용자 설명서

Upon receiving the incoming message to destination port 113, your WiFi modem router 

checks its session table and learns that there is an active session for port 113 associated 

with your computer. The WiFi modem router replaces the message’s destination IP address 

with your computer’s IP address and forwards the message to your computer.

When you finish your chat session, your WiFi modem router eventually senses a period of 

inactivity in the communications. The WiFi modem router then removes the session 

information from its session table, and incoming traffic is no longer accepted on port 

numbers 33333 or 113.

To configure port triggering, you need to know which inbound ports the application needs. 
Also, you need to know the number of the outbound port that triggers the opening of the 
inbound ports. You can usually determine this information by contacting the publisher of the 
application or user groups or newsgroups.

Only one computer at a time can use the triggered application.

Port Forwarding to Permit External Host Communications

In both of the preceding examples, your computer initiates an application session with a 
server computer on the Internet. However, you might need to allow a client computer on the 
Internet to initiate a connection to a server computer on your network. Normally, your WiFi 
modem router ignores any inbound traffic that is not a response to your own outbound traffic. 
You can configure exceptions to this default rule by using the port forwarding feature. 

A typical application of port forwarding can be shown by reversing the client-server 
relationship from the previous web server example. In this case, a remote computer’s 
browser needs to access a web server running on a computer in your local network. Using 
port forwarding, you can tell the WiFi modem router, “When you receive incoming traffic on 
port 80 (the standard port number for a web server process), forward it to the local computer 
at 192.168.1.123.” The following sequence shows the effects of the port forwarding rule you 
have defined:

The user of a remote computer opens a browser and requests a web page from 

www.example.com, which resolves to the public IP address of your WiFi modem router. 

The remote computer composes a web page request message with the following 

destination information: 

Destination address. The IP address of www.example.com, which is the address of your 
WiFi modem router.

Destination port number. 80, which is the standard port number for a web server 
process.

The remote computer then sends this request message through the Internet to your WiFi 
modem router.

Your WiFi modem router receives the request message and looks in its rules table for any 

rules covering the disposition of incoming port 80 traffic. Your port forwarding rule specifies 

that incoming port 80 traffic should be forwarded to local IP address 192.168.1.123.