Netgear R6300 User Manual download pdf (Page 71)

Security

R6300v2 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 TCP/UDP (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 the Add button.

Your changes are saved.

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 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 132 133

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Netgear R6300 User Manual Page 71