How The Router Implements The Port Forwarding Rule; Port Triggering; Add A Port Triggering Service - NETGEAR Nighthawk X4S R7800 User Manual

How the Router Implements the Port Forwarding Rule

The following sequence shows the effects of a port forwarding rule:
1. When you type the URL www.example.com in your browser, the browser sends 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 router.
• Destination port number. 80, which is the standard port number for a web server process.
2. Your router receives the message and finds your port forwarding rule for incoming port 80 traffic.
3. The router changes the destination in the message to IP address 192.168.1.123 and sends the message to that
computer.
4. Your web server at IP address 192.168.1.123 receives the request and sends a reply message to your router.
5. Your router performs Network Address Translation (NAT) on the source IP address and sends the reply through
the Internet to the computer or WiFi device that sent the web page request.

Port Triggering

Port triggering is a dynamic extension of port forwarding that is useful in these cases:
• An application must use port forwarding to more than one local computer (but not simultaneously).
• An application must open incoming ports that are different from the outgoing port.
With port triggering, the router monitors traffic to the Internet from an outbound "trigger" port that you specify. For
outbound traffic from that port, the router saves the IP address of the computer that sent the traffic. The router
temporarily opens the incoming port or ports that you specify in your rule and forwards that incoming traffic to that
destination.
Port forwarding creates a static mapping of a port number or range of ports to a single local computer. Port triggering
can dynamically open ports to any computer when needed and close the ports when they are no longer needed.
Note If you use applications such as multiplayer gaming, peer-to-peer connections, real-time
communications such as instant messaging, or remote assistance (a feature in Windows XP),
enable Universal Plug and Play (UPnP). See
and Play

Add a Port Triggering Service

To add a port triggering service:
1. Launch a web browser from a computer or WiFi device that is connected to the network.
2. Enter http://www.routerlogin.net.
A login window opens.
Nighthawk X4S AC2600 Smart WiFi Router
on page 79.
Customize Internet Traffic Rules for Ports
Improve Network Connections With Universal Plug
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