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How Port Triggering Changes the Communication Process, You open an IRC client program

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RangeMax™ Wireless-N Gigabit Router with USB WNR3500L User Manual • The destination address is your computer's IP address. • The destination port number is 5678, the browser session that made the initial request. Your router then sends this reply message to your computer, which displays the Web page from www.example.com. 6. When you finish your browser session, your router senses the termination of communications. Your router then removes the session information from its session table, and incoming traffic is no longer accepted on port number 33333. How Port Triggering Changes the Communication Process In the preceding example, requests are sent to a remote computer by your router from a particular service port number, and replies from the remote computer to your router are directed to that port number. If the remote server sends a reply back to a different port number, your router will not recognize it and will discard it. However, some application servers (such as FTP and IRC servers) send replies back to multiple port numbers. Using the port triggering function of your router, you can tell the router to open additional 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 must 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, beginning 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 having observed the destination port number of 6667, your router creates an additional session entry to send any incoming port 113 traffic to your computer. Customizing Your Network Settings v1.0, November 2009 5-13

Section	Page
RangeMax™ Wireless-N Gigabit Router with USB WNR3500L User Manual	1
Contents	7
About This Manual	11
Conventions, Formats, and Scope	11
How to Print This Manual	12
Revision History	12
Chapter 1 Configuring Your Internet Connection	13
Using the Setup Manual	13
Logging In to Your Wireless Router	14
Using the Setup Wizard	17
Viewing or Manually Configuring Your ISP Settings	17
Chapter 2 Safeguarding Your Network	21
Planning Your Wireless Network	21
Wireless Placement and Range Guidelines	22
Wireless Security Options	23
Manually Configuring Your Wireless Settings	24
Table 2-1. Wireless Settings	25
Configuring WEP Wireless Security	26
Configuring WPA, WPA2, or WPA/WPA2 Wireless Security	28
Using Push ‘N’ Connect to Configure Your Wireless Network	29
Using the WPS Button to Configure Your Network and Add a Client	30
Using a PIN to Configure Your Network and Add a Client	31
Configuring Advanced WPS Settings	33
Adding Both WPS-Capable Clients and Non-WPS-Capable Clients	34
Restricting Access to Your Router	35
Chapter 3 Protecting Your Network	37
Protecting Access to Your WNR3500L Router	37
Changing the Built-In Password	38
Restricting Access by MAC Address	39
Blocking Access to Internet Sites	40
Blocking Access to Internet Services	42
Configuring a User-Defined Service	43
Scheduling Blocking	44
Viewing Logs of Web Access or Attempted Web Access	45
Configuring E-mail Alert and Web Access Log Notifications	46
Setting the Time	47
Chapter 4 Using Network Monitoring Tools	48
Upgrading the Router Firmware	48
Upgrading Automatically to New Router Software	50
Upgrading Manually to New Router Software	50
Viewing Wireless Router Status Information	51
Table 4-1. Wireless Router Status Fields	52
Table 4-2. Connection Status Settings	54
Table 4-3. Router Statistics	55
Viewing a List of Attached Devices	56
Managing the Configuration File	56
Backing Up and Restoring the Configuration	57
Erasing the Configuration	58
Enabling Remote Management Access	58
Chapter 5 Customizing Your Network Settings	60
Using the LAN IP Setup Options	60
Using the Router as a DHCP Server	63
Using Address Reservation	63
Using a Dynamic DNS Service	64
Configuring the WAN Setup Options	66
Setting Up a Default DMZ Server	67
Configuring Static Routes	68
Allowing Inbound Connections to Your Network	70
How Your Computer Accesses a Remote Computer through Your Router	70
How Port Triggering Changes the Communication Process	72
How Port Forwarding Changes the Communication Process	73
How Port Forwarding Differs from Port Triggering	74
Configuring Port Forwarding to Local Servers	75
Adding a Custom Service	76
Editing or Deleting a Port Forwarding Entry	77
Configuring Port Triggering	77
Wireless Repeating (Also Called WDS)	80
Wireless Repeating Function	81
Setting Up the Base Station	82
Setting Up a Repeater Unit	83
Chapter 6 Fine-Tuning Your Network	84
Assessing Your Speed Requirements	85
Optimizing Your Network Bandwidth	86
Optimizing Wireless Performance	88
Changing the MTU Size	89
Quality of Service	90
Using WMM QoS for Wireless Multimedia Applications	91
Configuring QoS for Internet Access	91
Using Universal Plug and Play	96
Chapter 7 USB Storage	98
USB Drive Requirements	98
File Sharing Scenarios	99
USB Storage Basic Settings	101
Editing a Network Folder	103
Configuring USB Storage Advanced Settings	104
Creating a Network Folder	106
ReadyShare Access	107
Unmounting a USB Drive	107
Specifying Approved USB Devices	108
Connecting to the USB Drive from a Remote Computer	109
Locating the Internet Port IP Address	109
Accessing the Router’s USB Drive Remotely Using FTP	109
Connecting to the USB Drive with Microsoft Network Settings	109
Enabling File and Printer Sharing	110
Chapter 8 Troubleshooting	111
Quick Tips	111
Troubleshooting Basic Functions	113
Cannot Access the Router Main Menu	115
Cannot Access the Internet	116
Troubleshooting a Network Using the Ping Utility	118
Testing the LAN Path to Your Router	118
Testing the Path from Your Computer to a Remote Device	119
Problems with Date and Time	120
Wireless Connectivity	120
Using Your Wireless Card Setup Program	120
Setting Up and Testing Basic Wireless Connectivity	121
Restoring the Default Configuration and Password	124
Appendix A Default Configuration and Technical Specifications	125
Technical Specifications	127
Appendix B Related Documents	128

Match case Limit results 1 per page

RangeMax™ Wireless-N Gigabit Router with USB WNR3500L User Manual

Customizing Your Network Settings

5-13

v1.0, November 2009

•

The destination address is your computer’s IP address.

•

The destination port number is 5678, the browser session that made the initial request.

Your router then sends this reply message to your computer, which displays the Web page

from www.example.com.

When you finish your browser session, your router senses the termination of communications.

Your router then removes the session information from its session table, and incoming traffic

is no longer accepted on port number 33333.

How Port Triggering Changes the Communication Process

In the preceding example, requests are sent to a remote computer by your router from a particular

service port number, and replies from the remote computer to your router are directed to that port

number. If the remote server sends a reply back to a different port number, your router will not

recognize it and will discard it. However, some application servers (such as FTP and IRC servers)

send replies back to multiple port numbers. Using the port triggering function of your router, you

can tell the router to open additional 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 must 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:

You open an IRC client program, beginning a chat session on your computer.

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.

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.

Noting your port triggering rule, and having observed the destination port number of 6667,

your router creates an additional session entry to send any incoming port 113 traffic to your

computer.