Netgear AC1450 User Manual - Page 65

Port Triggering to Open Incoming Ports, The Block Services Setup screen displays

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AC1450 Smart WiFi Router The Block Services Setup screen displays: 5. From the Service Type list, select the application or service to allow or block. The list displays several common services, but you are not limited to these choices. To add any additional services or applications that do not already appear, select User Defined. 6. If you know that the application uses either TCP or UDP, select the appropriate protocol. If you are not sure, select Both. 7. Enter the starting and ending port numbers. If the application uses a single port number, enter that number in both fields. 8. Select the radio button for the IP address configuration you want to block, and enter the IP addresses. You can block the specified service for a single computer, a range of computers with consecutive IP addresses, or all computers on your network. 9. Click Add. Port Triggering to Open Incoming Ports Some application servers (such as FTP and IRC servers) send replies to multiple port numbers. Using the port triggering function of your router, you can tell the router to open more incoming ports when a particular outgoing port originates 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 have to also allow incoming traffic on port 113 to reach the originating computer." Using steps similar to the preceding example, the following sequence shows the effects of the port triggering rule you have defined: 1. You open an IRC client program to start a chat session on your computer. Security 65

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Security
65
AC1450 Smart WiFi Router
The Block Services Setup screen displays:
5.
From the Service Type list, select the application or service to allow or block.
The list displays several common services, but you are not limited to these choices. To
add any additional services or applications that do not already appear, select
User
Defined
.
6.
If you know that the application uses either TCP or UDP, select the appropriate protocol. If
you are not sure, select
Both
.
7.
Enter the starting and ending port numbers.
If the application uses a single port number, enter that number in both fields.
8.
Select the radio button for the IP address configuration you want to block, and enter the IP
addresses.
You can block the specified service for a single computer, a range of computers with
consecutive IP addresses, or all computers on your network.
9.
Click
Add
.
Port Triggering to Open Incoming Ports
Some application servers (such as FTP and IRC servers) send replies to multiple port
numbers. Using the port triggering function of your router, you can tell the router to open
more incoming ports when a particular outgoing port originates 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 have to also allow
incoming traffic on port 113 to reach the originating computer.” Using steps similar to the
preceding example, the following sequence shows the effects of the port triggering rule you
have defined:
1.
You open an IRC client program to start a chat session on your computer.