Netgear R6220 User Manual download pdf (Page 144)

Specify Internet Port Settings

144

AC1200 Smart WiFi Router with External Antennas

3. Enter the router user name and password.

The user name is admin.

The default password is password. The user name and

password are case-sensitive.

The BASIC Home screen displays.

4. Select ADV

ANCED > Advanced Setup > Port Forwarding/Port Triggering.

The Port Forwarding/Port Triggering screen displays.

5. Select the Port T

riggering radio button.

6. Select the Disable Port Triggering check box.

If this check box is selected, the router does not use port triggering even if you specified

port triggering settings.

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. Y

ou open an IRC client program to start a chat session on your computer.

2. Y

our 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. Y

our 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.

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Netgear R6220 User Manual Page 144