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Netgear RS400 Cyber Security Router Manual

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The BASIC Home page displays.
4.
Select ADVANCED > Advanced Setup > Port Forwarding / Port Triggering.
The Port Forwarding / Port Triggering page displays.
5. Select the Port Triggering radio button.
The port triggering settings display.
6.
In the Port Triggering Portmap Table, select the radio button for the service name.
7. Click the Delete Service button.
The rule is removed from the Port Triggering Portmap Table. If you want to reinstate
the rule, you must redefine it.
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 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 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 router.
3. 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.
4.
Noting your port triggering rule and observing the destination port number of 6667,
your 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 router using the NAT-assigned source
port (for example, port 33333) as the destination port and also sends an “identify”
message to your router with destination port 113.
6. When your 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
User Manual164Manage Port Forwarding and
Port Triggering Traffic Rules
Nighthawk AC2300 Cybersecurity WiFi Router Model RS400
… 164 …


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