NETGEAR JNR1010 manual Remote Computer Access Basics, Destination port number

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N150 4-Port Wireless Router JNR1010

Remote Computer Access Basics

When a computer on your network needs to access a computer on the Internet, your computer sends your router a message containing the source and destination address and process information. Before forwarding your message to the remote computer, your router must modify the source information and create and track the communication session so that replies can be routed back to your computer.

Following an example of normal outbound traffic and the resulting inbound responses:

1.You open a browser, and your operating system assigns port number 5678 to this browser session.

2.You type http://www.example.com into the URL field, and your computer creates a web page request message with the following address and port information:

•Source address. Your computer’s IP address.

•Source port number. 5678, which is the browser session.

•Destination address. The IP address of www.example.com, which your computer finds by asking a DNS server.

•Destination port number. 80, which is the standard port number for a web server process.

The request message is sent to your router.

3.Your router creates an entry in its internal session table describing this communication session between your computer and the web server at www.example.com. Before sending 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 step 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 assigned by the router, such as 33333. This step 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. 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.

The web server then sends this reply message to your router.

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

Advanced Settings

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Contents N150 4-Port Wireless Router JNR1010 Technical Support TrademarksStatement of Conditions Contents Security Appendix B Notification of Compliance Index Getting to know your router Hardware SetupPosition Your Router Unpack Your RouterFront Panel Hardware FeaturesLED Side PanelLabel Back PanelGetting Started with Netgear genie Connecting to the routerWireless Devices and Security Settings Router Setup PreparationUse Standard TCP/IP Properties for Dhcp Gather ISP InformationTypes of Logins Netgear genie Setup To use Netgear genie to set up your router  To troubleshoot Internet access problems Use Netgear genie After InstallationRouter Dashboard Basic Home Screen Upgrade Router FirmwareJoin Your Wireless Network  To use WPS to join the wireless networkWPS Method Netgear genie App and Mobile genie App Manual Method To connect manually N150 4-Port Wireless Router JNR1010 Your Internet connection and network Genie Basic SettingsInternet Setup Does Your ISP Require a Login? Answer either yes or no Internet Setup Screen FieldsAttached Devices Parental Controls  To set up Live Parental ControlsN150 4-Port Wireless Router JNR1010 Click the Take me to the status screen button Basic Wireless Settings To view or change basic wireless settings Wireless Settings Screen Fields To change WPA Security Option and Passphrase ModeGuest Networks  To set up a guest networkFastLane Guest Network Wireless Security Options To set up the FastLane feature Genie Advanced Home Specifying custom settingsSetup Wizard  To use the setup wizard againSelect Setup Wizard  To use the WPS Wizard Select Advanced WPS Wizard WPS WizardWAN Setup Setup MenuDefault DMZ Server Change the MTU Size  To set up a default DMZ serverLAN Setup  To change the MTU size Select Advanced Setup WAN SetupLAN IP address LAN Setup Screen Settings  To change the LAN settingsLAN TCP/IP Setup Use the Router as a Dhcp Server  To reserve an IP address Address ReservationEnable WMM QoS for Wireless Multimedia Applications Quality of Service QoS Setup To create a QoS policy for applications and online games Set Up QoS for Applications and Online GamingClick the Add Priority Rule button Set up QoS for a Router LAN PortClick Add Priority Rule Set up QoS for a MAC Address To edit or delete a QoS policy Edit or Delete an Existing QoS PolicySecurity Keeping unwanted content out of your networkKeyword Blocking of Http Traffic  To delete a keyword or domain To specify a trusted computer  To block services Block Services Port FilteringUser Defined  To schedule blocking Schedule BlockingSecurity Event Email Notifications  To set up email notificationsManaging your network Administration To check for new firmware and update your router Upgrade the Router FirmwareRouter Status View Router StatusInternet Port N150 4-Port Wireless Router JNR1010 Wireless AP  To view web access logs View Logs of Web Access or Attempted Web AccessBack Up Settings Manage the Configuration FileRestore Configuration Settings  To restore configuration settings that you backed upErase Set PasswordAdvanced Settings  To configure advanced wireless settings Advanced Wireless SettingsRestrict Wireless Access by MAC Address Select the Turn Access Control On check box Wireless Repeating Function WDSRepeater access point Base station access point Wireless Repeating Function  To set up the base station Set Up the Base StationSet Up a Repeater Unit  To configure the router as a repeater unitPort Forwarding and Triggering Destination port number Remote Computer Access BasicsPort Triggering to Open Incoming Ports Port 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 Click Edit Service or Delete Service Set Up Port TriggeringEdit or Delete a Port Forwarding Entry  To edit or delete a port forwarding entryUniversal Plug and Play on Dynamic DNS Select the Use a Dynamic DNS Service check box  To set up Dynamic DNSStatic Routes  To set up a static routeRemote Management Universal Plug and Play  To enable Universal Plug and Play Traffic Meter Troubleshooting Network Settings Wireless SettingsQuick Tips Sequence to Restart Your NetworkTroubleshooting with the LEDs Power LED Is Off or BlinkingInternet or Ethernet Port LEDs Are Off Cannot Log In to the Router Wireless LED Is OffYour Router Cannot Obtain an IP Address from the ISP Cannot Access the InternetTroubleshooting PPPoE Select Administration Router Status Click Connection Status To troubleshoot a PPPoE connection Changes Not Saved Troubleshooting Internet BrowsingWireless Connectivity Restore the Factory Settings and PasswordWireless Signal Strength Troubleshoot Your Network Using the Ping Utility Test the LAN Path to Your Router To ping the router from a Windows computer  To test the path from a Windows computer Test the Path from Your Computer to a Remote DeviceSupplemental Information Factory SettingsWPA2-PSK AES Technical SpecificationsSupplemental Information Notification of Compliance Netgear Wireless Routers, Gateways, APsNotification of Compliance Interference Reduction Table 100 Index101 102 103
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