NETGEAR WNDR3700V4 user manual Port Triggering to Open Incoming Ports, Destination port number

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N600 Wireless Dual Band Gigabit Router WNDR3700v4

the web page request message to www.example.com, your router stores the original 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. Replies from the remote computer to your router are directed to that port number. If the remote server sends a reply 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 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 October 2013 East Plumeria Drive San Jose, CA N600 Wireless Dual Band Gigabit Router WNDR3700v4Support Contents Netgear genie Advanced Home Advanced Settings Appendix a Supplemental Information Getting to know your router Hardware SetupHardware Features Unpack Your RouterFront Panel Icon Description Label Back PanelPosition Your Router Attach the StandCable Your Router Verify the Cabling N600 Wireless Dual Band Gigabit Router WNDR3700v4 Getting Started with Netgear Genie Connecting the routerTypes of Logins and Access Router Setup PreparationWireless Devices and Security Settings Use Standard TCP/IP Properties for DhcpUpgrade the Firmware Use Netgear genie after InstallationBasic Home screen with dashboard, language, and online help Dashboard Basic Home ScreenWi-Fi Protected Setup WPS Method Join Your Wireless Network To use WPS to join the wireless network Manual MethodNetgear genie App and Mobile genie App Your Internet connection and network Netgear genie Basic SettingsInternet Setup  To view or change the basic Internet setupBasic Home Screen Internet Setup Screen Fields Does Your ISP Require a Login? Answer either yes or noInternet IP Address  To go to the Attached Devices screen Attached DevicesParental Controls  To set up Live Parental ControlsN600 Wireless Dual Band Gigabit Router WNDR3700v4 Click the Take me to the status screen button ReadySHARE Storage To view or change basic wireless settings Basic Wireless SettingsWireless Settings Screen Fields Wireless Network 2.4 GHz b/g/n and 5 GHzRegion Selection Change WPA Security Option and Password Security Options Settings To change the WPA settings Guest Networks  To set up a guest network Select Basic Guest NetworkWPA Encryption Guest Network Wireless Security OptionsNetgear genie Advanced Home Specify custom settingsSetup Wizard  To use the Setup WizardNetgear genie Advanced Home Screen WPS Wizard  To use the WPS Wizard Select Advanced WPS WizardSelect either Push Button or PIN Number Setup Menu WAN Setup  To set up a default DMZ server Default DMZ ServerCommon MTU sizes Change the MTU SizeLAN Setup  To change the MTU size Select Advanced Setup WAN Setup To change the LAN settings LAN Setup Screen Settings LAN TCP/IP SetupUse Router as a Dhcp Server Use the Router as a Dhcp Server Address ReservationAddress Reservation Enable WMM QoS for Wireless Multimedia Applications Quality of Service QoS Setup To configure QoS  To reserve an IP addressSet Up QoS for Internet Access QoS for Applications and Online Gaming To create a QoS policy for applications and online games Select the Turn Internet Access QoS On check box QoS for a Router LAN PortClick the Add Priority Rule button QoS for a MAC Address  To edit or delete a QoS policy Select Advanced QoS SetupEdit or Delete an Existing QoS Policy Click Add Priority RuleStorage Accessing and configuring a USB storage To access the USB device from Windows ReadySHARE AccessFile-Sharing Scenarios Share PhotosStore Files in a Central Location for Printing Share Large Files over the Internet To share files with your friends and family Storage Basic Settings  To go to Storage Basic Settings Select Basic ReadySHARE To access your USB device Select Basic ReadySHARE, and click Edit Add or Edit a Network Folder To go to USB Storage Advanced Settings Storage Advanced SettingsSafely Remove a USB Drive Media ServerAvailable Network Folders Select the Allow only approved devices check box Specify Approved USB Devices To connect to the router’s USB drive using a web browser Access the Router USB Drive Remotely Using FTPConnect to the USB Drive from a Remote Computer Ftp//10.1.65.4Security Keep unwanted content out of your networkSelect Advanced Security Block Sites Keyword Blocking of Http Traffic To delete a keyword or domain  To specify a trusted computer To block services Select Advanced Security Block Services Block Services Port FilteringN600 Wireless Dual Band Gigabit Router WNDR3700v4  To schedule blocking Schedule BlockingSecurity Event Email Notifications Manage your network Administration To check for new firmware and update your router Router Information View Router StatusHardware Version. The router model LAN PortShow Statistics Button Internet PortView connection status information Connection Status ButtonWireless Settings 2.4 GHz and 5 GHz View Logs of Web Access or Attempted Web Access Back Up Settings Manage the Configuration FileRestore Configuration Settings ErasePassword Recovery Set PasswordCustomize your network Advanced SettingsAdvanced Wireless Settings  To restrict access based on MAC addresses Restrict Wireless Access by MAC AddressSelect the Turn Access Control On check box Wireless APSelect the Enable Access Point Mode check box Wireless Repeating Function WDSWireless repeating scenario Following settings are available  To view or change the Wireless Repeating Function settings 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 Port 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 Edit or Delete a Port Forwarding Entry To edit or delete a port forwarding entry Click Edit Service or Delete Service Set Up Port TriggeringApplication Example Making a Local Web Server Public  To make a local web server publicN600 Wireless Dual Band Gigabit Router WNDR3700v4  To set up Dynamic DNS Select the Use a Dynamic DNS Service check boxDynamic DNS Static Routes  To set up a static route Remote Management USB Settings Universal Plug and Play To turn on Universal Plug and Play IPv6  To set up an IPv6 Internet connection typeIPv6 LAN Setup Auto Detect FieldsIPv6 Filtering Auto Config Pass Through 6to4 TunnelIPv6 Fixed WAN Setup IPb6 Fixed LAN SetupFixed Dhcp PPPoE Traffic Meter Troubleshooting Quick Tips Power LED Is Off or Blinking Troubleshoot with the LEDsLEDs Never Turn Off Wireless 2.4 GHz and 5 GHz LEDs Are Off Cannot Log In to the RouterInternet LED Is Off Cannot Access the Internet Wireless Connectivity Changes Not SavedIncorrect Date or Time Wireless Signal Strength Supplemental Information Factory default settings Factory SettingsWPA2-PSK AES Technical Specifications111 Notification of Compliance Netgear Dual Band WirelessFCC Caution Avertissement Important Note Radiation Exposure Statement
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