Application Example: Port Triggering For Internet Relay Chat [Router Mode] - NETGEAR WiFi 6 AX1800 User Manual

WiFi 6 AX1800 Dual Band Wireless Access Point WAX204
The port triggering settings display.
6. Select the Disable Port Triggering check box.
If this check box is selected, the AP does not apply port triggering rules even if you
specified them.
7. Click the Apply button.
Your settings are saved.
Application example: Port triggering for Internet Relay Chat
[router mode]
Some application servers, such as FTP and IRC servers, send replies to multiple port
numbers. Using port triggering (if the AP is in router mode), you can tell the AP 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 AP, "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 AP.
3. Your AP creates an entry in its internal session table describing this communication
session between your computer and the IRC server. Your AP 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 AP creates another session entry to send any incoming port 113 traffic to your
computer.
5. The IRC server sends a return message to your AP using the NAT-assigned source
port (for example, port 33333) as the destination port and also sends an "identify"
message to your AP with destination port 113.
6. When your AP 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 AP restores the original address information replaced by NAT and sends
this reply message to your computer.
Port Forwarding and Port
Triggering [Router Mode]
223 User Manual