NETGEAR WNDR4500 user manual Port Triggering to Open Incoming Ports, Destination port number

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N900 Wireless Dual Band Gigabit Router WNDR4500

information and then modifies the source information in the request message, performing Network Address Translation (NAT):

•The source address is replaced with your router’s public IP address. This is necessary because your computer uses a private IP address that is not globally unique and cannot be used on the Internet.

•The source port number is changed to a number chosen by the router, such as 33333. This is necessary because two computers could independently be using the same session number.

Your router then sends this request message through the Internet to the web server at www.example.com.

4.The web server at www.example.com composes a return message with the requested web page data. The return message contains the following address and port information. The web server then sends this reply message to your router.

Source address. The IP address of www.example.com.

Source port number. 80, which is the standard port number for a web server process. Destination address. The public IP address of your router.

Destination port number. 33333.

5.Upon receiving the incoming message, your router checks its session table to determine whether there is an active session for port number 33333. Finding an active session, the router then modifies the message to restore the original address information replaced by NAT. Your router sends this reply message to your computer, which displays the web page from www.example.com. The message now contains the following address and port information.

Source address. The IP address of www.example.com.

Source port number. 80, which is the standard port number for a web server process. Destination address. Your computer’s IP address.

Destination port number. 5678, which is the browser session that made the initial request.

6.When you finish your browser session, your router eventually detects a period of inactivity in the communications. Your router then removes the session information from its session table, and incoming traffic is no longer accepted on port number 33333.

Port Triggering to Open Incoming Ports

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 does not recognize it and discards 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.

Advanced Settings

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Contents N900 Wireless Dual Band Gigabit Router WNDR4500 Technical Support TrademarksStatement of Conditions Contents Genie Advanced Home Administration Appendix a Supplemental Information Hardware Setup Position Your Router Unpack Your RouterFront Panel Hardware FeaturesLED Router, rear view Back PanelLabel Getting Started with Netgear Genie Use Standard TCP/IP Properties for Dhcp Router Setup PreparationTypes of Logins and Access Wireless Devices and Security SettingsNetgear Genie Setup  To use Netgear Genie to set up your routerBrowse to http//routerlogin.net Upgrade Router Firmware Use Netgear Genie after InstallationRouter Dashboard Basic Home Screen Manual Method Add Wireless Devices or Computers to Your NetworkWi-Fi Protected Setup WPS Method  To use WPS to join the wireless networkGenie Basic Settings Internet Setup Internet Setup Screen FieldsDoes Your ISP Require a Login? Answer either yes or no Internet IP Address Attached Devices ReadySHARE USB Storage Parental Controls To view or change basic wireless settings Basic Wireless SettingsWireless Settings Screen Fields Wireless Network GHz b/g/n and 5.0 GHz a/nRegion Selection Change WPA Security Option and Passphrase Security Options SettingsGuest Networks  To set up a guest networkWPA Encryption Guest Network Wireless Security OptionsGenie Advanced Home Setup Wizard WPS Wizard Select Advanced WPS WizardSelect either Push Button or PIN Number Setup Menu WAN Setup Default DMZ Server  To set up a default DMZ serverChange the MTU Size Common MTU Sizes  To change the MTU size Select Advanced Setup WAN Setup To change the LAN settings LAN SetupUse the Router as a Dhcp Server LAN Setup Screen Settings To reserve an IP address Address ReservationQuality of Service QoS Setup Enable WMM QoS for Wireless Multimedia ApplicationsSet Up QoS for Internet Access  To create a QoS policy for applications and online games QoS for Applications and Online GamingClick the Add Priority Rule button QoS for a Router LAN PortClick Add Priority Rule QoS for a MAC Address To edit or delete a QoS policy Editing or Deleting an Existing QoS PolicyUSB Storage ReadySHARE Access USB Drive RequirementsFile-Sharing Scenarios  To share files with your friends and family Sharing PhotosStoring Files in a Central Location for Printing Sharing Large Files over the InternetBasic Settings Add or Edit a Network Folder  To access your USB deviceUSB Storage Advanced Settings Available Network Folders Safely Remove a USB Drive Media Server SettingsSpecify Approved USB Devices Select the Allow only approved devices check box Access the Router’s USB Drive Remotely Using FTP To connect to the router’s USB drive using a web browser Connect to the USB Drive from a Remote ComputerReadySHARE Printer ReadySHARE Printer  To set up ReadySHARE PrinterN900 Wireless Dual Band Gigabit Router WNDR4500 N900 Wireless Dual Band Gigabit Router WNDR4500 N900 Wireless Dual Band Gigabit Router WNDR4500 N900 Wireless Dual Band Gigabit Router WNDR4500 USB Control Center Utility USB Printer Control Center ConfigurationScan with a Multi-Function Printer USB Speaker To control a USB speaker Desktop Netgear Genie Security Keyword Blocking of Http Traffic  To delete a keyword or domain To specify a trusted computer  To block services Block Services Port FilteringSchedule Blocking  To schedule blocking Security Event Email Notifications To set up email notifications Administration Upgrade the Router Firmware LAN Port Internet Provider WAN SetupView Router Status Router InformationSystem up time and poll interval statistics Statistics ButtonView connection status information Connection Status ButtonWireless Settings 2.4 GHz and 5 GHz Guest Network 2.4 GHz and 5 GHz View Logs of Web Access or Attempted Web AccessManage the Configuration File Do not interrupt the reboot process Back Up SettingsRestore Configuration Settings  To restore configuration settings that you backed upPassword Recovery Set PasswordAdvanced Settings Advanced Wireless Settings Wireless repeating scenario Wireless Repeating Function WDSWireless Repeating Function  To set up the base station Set Up the Base Station To configure the router as a repeater unit Set Up a Repeater UnitPort Forwarding and Triggering Remote Computer Access BasicsDestination port number Port Triggering to Open Incoming PortsPort Forwarding to Permit External Host Communications How Port Forwarding Differs from Port Triggering  To set up port forwarding Set Up Port Forwarding to Local ServersAdd a Custom Service  To edit or delete a port forwarding entry Click Edit Service or Delete ServiceEditing or Deleting a Port Forwarding Entry Application Example Making a Local Web Server PublicUniversal Plug and Play on Set Up Port TriggeringN900 Wireless Dual Band Gigabit Router WNDR4500 Dynamic DNS Forward traffic to a changing IP address Static Routes  To set up a static route Remote Management Universal Plug and Play USB Settings To turn on Universal Plug and Play  To set up an IPv6 Internet connection type IPv6Traffic Meter 103 Troubleshooting Sequence to Restart Your Network Wireless SettingsNetwork Settings Quick TipsTroubleshooting with the LEDs Power/Test LED Is Off or BlinkingPower/Test LED Stays Amber Push N Connect WPS Button Blinks Amber Wireless LEDs Are OffLEDs Never Turn Off Internet or Ethernet Port LEDs Are OffCannot Log In to the Router Cannot Access the Internet109  To troubleshoot a PPPoE connection Troubleshooting PPPoETroubleshooting Internet Browsing Select Administration Router StatusChanges Not Saved Wireless ConnectivityRestore the Factory Settings and Password Wireless Signal StrengthTroubleshoot Your Network Using the Ping Utility Test the LAN Path to Your Router To ping the router from a running Windows PC Test the Path from Your Computer to a Remote Device Supplemental Information Factory Settings115 WNDR4500 Router specifications Technical Specifications117 Netgear Dual Band Wireless Regulatory Compliance InformationEurope EU Declaration of Conformity 119 FCC Caution FCC Requirements for Operation in the United StatesGPL License Agreement Industry CanadaImportant Note Radiation Exposure Statement AvertissementInterference Reduction Table Index 124 125 126
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