NETGEAR RangeMax™ NEXT Wireless Router WNR834B User Manual
a.You open an IRC client program, beginning a chat session on your computer.
b.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 router.
c.Your router creates an entry in its internal session table describing this communication session between your computer and the IRC server. Your 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.
d.Noting your Port Triggering rule, and having observed the destination port number of 6667, your router creates an additional session entry to send any incoming port 113 traffic to your computer.
e.The IRC server sends a return message to your router using the
f.Upon receiving the incoming message to destination port 33333, your router checks its session table to determine whether there is an active session for port number 33333. Finding an active session, the router restores the original address information replaced by NAT and sends this reply message to your computer.
g.Upon receiving the incoming message to destination port 113, your router checks its session table and learns that there is an active session for port 113, associated with your computer. The router replaces the message’s destination IP address with your computer’s IP address and forwards the message to your computer.
h.When you finish your chat session, your router eventually senses a period of inactivity in the communications. The 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 outbound port number that will trigger the opening of the inbound ports. This information can usually be determined by contacting the publisher of the application or from user groups or newsgroups..
Note: Only one computer at a time can use the triggered application.
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