N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000
the wireless modem router to open additional incoming ports when a particular outgoing port originates a session.
An example is Internet Relay Chat (IRC). Your computer connects to an IRC server at destination port 6667. The IRC server not only responds to your originating source port, but also sends an “identify” message to your computer on port 113. Using port triggering, you can tell the wireless modem router, “When you initiate a session with destination port 6667, you have to also allow incoming traffic on port 113 to reach the originating computer.” Using steps similar to the preceding example, the following sequence shows the effects of the port triggering rule you have defined:
1.You open an IRC client program to start a chat session on your computer.
2.Your IRC client composes a request message to an IRC server using a destination port number of 6667, the standard port number for an IRC server process. Your computer then sends this request message to your wireless modem router.
3.Your wireless modem router creates an entry in its internal session table describing this communication session between your computer and the IRC server. Your wireless modem router stores the original information, performs Network Address Translation (NAT) on the source address and port, and sends this request message through the Internet to the IRC server.
4.Noting your port triggering rule and having observed the destination port number of 6667, your wireless modem router creates an additional session entry to send any incoming port 113 traffic to your computer.
5.The IRC server sends a return message to your wireless modem router using the
6.Upon receiving the incoming message to destination port 33333, your wireless modem router checks its session table to determine whether there is an active session for port number 33333. Finding an active session, the wireless modem router restores the original address information replaced by NAT and sends this reply message to your computer.
7.Upon receiving the incoming message to destination port 113, your wireless modem router checks its session table and learns that there is an active session for port 113 associated with your computer. The wireless modem router replaces the message’s destination IP address with your computer’s IP address and forwards the message to your computer.
8.When you finish your chat session, your wireless modem router eventually senses a period of inactivity in the communications. The wireless 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.
Note: Only one computer at a time can use the triggered application.
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