Netgear WAC124 User Manual For Firmware version less than 1.0.4.2 - Page 237
Router mode application example: Port triggering for Internet Relay Chat, traffic to your computer.
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AC2000 802.11ac Wireless Access Point/Router WAC124 8. Click the Apply button. Your settings are saved. Router mode application example: Port triggering for Internet Relay Chat Some application servers, such as FTP and IRC servers, send replies to multiple port numbers. Using port triggering, you can tell the access point/router to open more incoming ports when a particular outgoing port starts 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 access point/router, "When you initiate a session with destination port 6667, you must also allow incoming traffic on port 113 to reach the originating computer." The following sequence shows the effects of this port triggering rule: 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 access point/router. 3. Your access point/router creates an entry in its internal session table describing this communication session between your computer and the IRC server. Your access point/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 observing the destination port number of 6667, your access point/router creates another session entry to send any incoming port 113 traffic to your computer. 5. The IRC server sends a return message to your access point/router using the NAT-assigned source port (for example, port 33333) as the destination port and also sends an "identify" message to your access point/router with destination port 113. 6. When your access point/router receives the incoming message to destination port 33333, it checks its session table to see if a session is active for port number 33333. Finding an active session, the access point/router restores the original address information replaced by NAT and sends this reply message to your computer. 7. When your access point/router receives the incoming message to destination port 113, it checks its session table and finds an active session for port 113 associated with your computer. The access point/router replaces the message's destination IP address with your computer's IP address and forwards the message to your computer. Router Mode: Manage Port 237 Forwarding and Port Triggering User Manual