NETGEAR WNDR3700 user manual Port Forwarding to Permit External Host Communications

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N600 Wireless Dual Band Gigabit Router WNDR3700v4

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.You open an IRC client program to start 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.

5.The IRC server sends a return message to your router using the NAT-assigned source port (as in the previous example, say port 33333) as the destination port. The IRC server also sends an “identify” message to your router with destination port 113.

6.Upon receiving the incoming message to destination port 33333, your router checks its session table to determine whether there is an active session for port number 33333. Finding an active session, the router restores the original address information replaced by NAT and sends this reply message to your computer.

7.Upon receiving the incoming message to destination port 113, your router checks its session table and learns that there is an active session for port 113, associated with your computer. The router replaces the message’s destination IP address with your computer’s IP address and forwards the message to your computer.

8.When you finish your chat session, your router eventually senses a period of inactivity in the communications. The router then removes the session information from its session table, and incoming traffic is no longer accepted on port numbers 33333 or 113.

To configure port triggering, you need to know which inbound ports the application needs. Also, you need to know the number of the outbound port that will trigger the opening of the inbound ports. Usually, you can determine this information by contacting the publisher of the application or the relevant user groups or news groups.

Note: Only one computer at a time can use the triggered application.

Port Forwarding to Permit External Host Communications

In both of the preceding examples, your computer initiates an application session with a server computer on the Internet. However, you might need to allow a client computer on the

Advanced Settings

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Contents N600 Wireless Dual Band Gigabit Router WNDR3700v4 Compliance SupportTrademarks Contents Netgear genie Advanced Home Advanced Settings Appendix a Supplemental Information Hardware Setup Getting to know your routerUnpack Your Router Hardware FeaturesFront Panel Icon Description Back Panel LabelAttach the Stand Position Your RouterCable Your Router Verify the Cabling Hardware Setup Connecting the router Getting Started with Netgear GenieWireless Devices and Security Settings Router Setup PreparationTypes of Logins and Access Use Standard TCP/IP Properties for DhcpUse Netgear genie after Installation Upgrade the FirmwareDashboard Basic Home Screen Basic Home screen with dashboard, language, and online help To use WPS to join the wireless network Join Your Wireless NetworkWi-Fi Protected Setup WPS Method Manual MethodNetgear genie App and Mobile genie App Netgear genie Basic Settings Your Internet connection and network To view or change the basic Internet setup Internet SetupBasic Home Screen Does Your ISP Require a Login? Answer either yes or no Internet Setup Screen FieldsInternet IP Address Attached Devices  To go to the Attached Devices screen To set up Live Parental Controls Parental ControlsNetgear genie Basic Settings ReadySHARE Storage Click the Take me to the status screen buttonBasic Wireless Settings  To view or change basic wireless settingsWireless Network 2.4 GHz b/g/n and 5 GHz Wireless Settings Screen FieldsRegion Selection Security Options Settings Change WPA Security Option and Password To change the WPA settings  To set up a guest network Select Basic Guest Network Guest NetworksGuest Network Wireless Security Options WPA EncryptionSpecify custom settings Netgear genie Advanced Home To use the Setup Wizard Setup WizardNetgear genie Advanced Home Screen  To use the WPS Wizard Select Advanced WPS Wizard 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 LAN Setup To change the LAN settings LAN TCP/IP Setup LAN Setup Screen SettingsUse Router as a Dhcp Server Address Reservation Use the Router as a Dhcp ServerAddress Reservation  To configure QoS Quality of Service QoS SetupEnable WMM QoS for Wireless Multimedia Applications  To reserve an IP addressQoS for Applications and Online Gaming Set Up QoS for Internet Access To create a QoS policy for applications and online games QoS for a Router LAN Port Select the Turn Internet Access QoS On check boxClick the Add Priority Rule button Edit or Delete an Existing QoS Policy  To edit or delete a QoS policy Select Advanced QoS SetupQoS for a MAC Address Click Add Priority RuleAccessing and configuring a USB storage StorageFile-Sharing Scenarios ReadySHARE Access To access the USB device from Windows Share PhotosShare Large Files over the Internet Store Files in a Central Location for Printing To share files with your friends and family  To go to Storage Basic Settings Select Basic ReadySHARE Storage Basic Settings To access your USB device Add or Edit a Network Folder Select Basic ReadySHARE, and click EditStorage Advanced Settings  To go to USB Storage Advanced SettingsMedia Server Safely Remove a USB DriveAvailable Network Folders Specify Approved USB Devices Select the Allow only approved devices check boxConnect to the USB Drive from a Remote Computer Access the Router USB Drive Remotely Using FTP To connect to the router’s USB drive using a web browser Ftp//10.1.65.4Keep unwanted content out of your Security To delete a keyword or domain Keyword Blocking of Http TrafficSelect Advanced Security Block Sites  To specify a trusted computerBlock Services Port Filtering  To block services Select Advanced Security Block ServicesSecurity Schedule Blocking  To schedule blockingSecurity Event Email Notifications Administration Manage your network To check for new firmware and update your router Hardware Version. The router model View Router StatusRouter Information LAN PortInternet Port Show Statistics ButtonWireless Settings 2.4 GHz and 5 GHz Connection Status ButtonAdministration View Logs of Web Access or Attempted Web Access Restore Configuration Settings Manage the Configuration FileBack Up Settings EraseSet Password Password RecoveryAdvanced Settings Customize your networkAdvanced Wireless Settings Restrict Wireless Access by MAC Address  To restrict access based on MAC addresses Wireless APSelect the Turn Access Control On check box Wireless Repeating Function WDS Select the Enable Access Point Mode check boxWireless repeating scenario  To view or change the Wireless Repeating Function settings Following settings are availableSet Up the Base Station  To set up the base stationSet Up a Repeater Unit  To configure the router as a repeater unitRemote Computer Access Basics Port Forwarding and Port TriggeringPort Triggering to Open Incoming Ports Destination port numberPort Forwarding to Permit External Host Communications How Port Forwarding Differs from Port Triggering Set Up Port Forwarding to Local Servers  To set up port forwardingAdd a Custom Service Edit or Delete a Port Forwarding Entry Set Up Port TriggeringApplication Example Making a Local Web Server Public Advanced Settings Dynamic DNS Select the Use a Dynamic DNS Service check box  To set up Dynamic DNSStatic 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 IPv6Auto Detect Fields IPv6 LAN SetupIPv6 Filtering Auto Config 6to4 Tunnel Pass ThroughIPb6 Fixed LAN Setup IPv6 Fixed WAN SetupFixed Dhcp PPPoE Traffic Meter Troubleshooting Quick Tips LEDs Never Turn Off Power LED Is Off or BlinkingTroubleshoot with the LEDs Internet LED Is OffWireless 2.4 GHz and 5 GHz LEDs Are Off Cannot Access the InternetCannot Log In to the Router Troubleshooting 105 Changes Not Saved Wireless ConnectivityIncorrect Date or Time Wireless Signal Strength Supplemental Information Factory Settings Factory default settingsTechnical Specifications WPA2-PSK AESSupplemental Information 111