NETGEAR DG814 DSL manual Table B-1. Netmask Notation Translation Table for One Octet

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Reference Manual for the Model DG814 DSL Modem Internet Gateway

The following table lists the additional subnet mask bits in dotted-decimal notation. To use the table, write down the original class netmask and replace the 0 value octets with the dotted-decimal value of the additional subnet bits. For example, to partition your Class C network with subnet mask 255.255.255.0 into 16 subnets (4 bits), the new subnet mask becomes 255.255.255.240.

Table B-1. Netmask Notation Translation Table for One Octet

Number of Bits

Dotted-Decimal Value

1128

2192

3224

4240

5248

6252

7254

8255

The following table displays several common netmask values in both the dotted-decimal and the masklength formats.

Table B-2. Netmask Formats

Dotted-Decimal Masklength

255.0.0.0/8

255.255.0.0/16

255.255.255.0 /24

255.255.255.128 /25

255.255.255.192 /26

255.255.255.224 /27

255.255.255.240 /28

255.255.255.248 /29

255.255.255.252 /30

255.255.255.254 /31

255.255.255.255 /32

B-6	Networks and Routing Basics

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Contents NETGEAR, Inc Trademarks World Wide Web Page Contents Chapter Preparing Your Network Chapter Maintenance Appendix a Technical Specifications Figure B-1 Page Table B-1 Xii About This Guide Technical Support Related PublicationsXiv About This Guide Typographical Conventions Special Message FormatsPage Key Features Chapter IntroductionAbout the Gateway Introduction Content Filtering SecurityAutosensing 10/100 Ethernet Easy Installation and Management TCP/IPMaintenance and Support Introduction Chapter Setting Up the Hardware Package ContentsAccess Requirement Local Network Hardware RequirementsGateway’s Front Panel PC RequirementsGateway’s Rear Panel LED DescriptionsConnecting the Gateway Connecting to your Local Ethernet Network Typical installationConnecting to Your Adsl Service and Telephone Provider Adsl through a modular RJ-11 wall jackConnecting the Power Adapter Verifying PowerAdsl through other wall jacks Setting Up the Hardware Chapter Preparing Your Network Preparing Your Personal Computers for IP NetworkingConfiguring Windows 95, 98, and ME for IP Networking Install or Verify Windows Networking ComponentsPreparing Your Network Assign TCP/IP configuration by Dhcp Selecting Internet Access MethodConfiguring Windows NT or 2000 for IP Networking Verifying TCP/IP Properties WindowsConfiguring the Macintosh for IP Networking Verifying TCP/IP PropertiesMacOS 8.6 or MacOS Your Internet Account Verifying TCP/IP Properties MacintoshLogin Protocols Account InformationObtaining ISP Configuration Information Windows Ready for Configuration Obtaining ISP Configuration Information MacintoshRestarting the Network Preparing Your Network Chapter Basic Configuration of the Gateway Accessing the Web Configuration ManagerLogin window opens as shown in -1below Browser-based configuration main menu Configuration using the Setup Wizard Configuring for Dynamic IP Account Setup Wizard menu for Dynamic IP addressConfiguring for Fixed IP Account Setup Wizard menu for Fixed IP addressConfiguring for an Account with Login Setup Wizard menu for PPPoE login accountsManual Configuration Completing the Configuration Basic Configuration of the Gateway Chapter Content Filtering Configuring for Content FilteringLogs Block Sites Schedule Mail Content Filtering Chapter Maintenance Gateway StatusThis screen shows the following parameters Dhcp This screen shows the following statistics PPPoE Status screen Attached Devices Ping Status screenConfiguration File Settings Management Restore and Backup the ConfigurationChanging the Configuration Password Erase the ConfigurationGateway Upgrade Gateway Upgrade menuMaintenance Advanced Configuration of the Gateway Configuring for Port Forwarding to Local ServersAdd a Custom Service Edit or Delete a Port Forwarding Entry Local Web and FTP Server ExampleTip Multiple Computers for Half Life, Kali or Quake NAT Status Security DMZ ServerDynamic DNS Respond to Ping on Internet WAN PortLAN IP Setup LAN IP Setup MenuLAN TCP/IP Setup Use router as Dhcp serverStatic Routes Static Route Summary Table Static Route Example Advanced Configuration of the Gateway Chapter Troubleshooting Basic FunctioningPWR LED Not On Troubleshooting the Web Configuration Interface Test LED Never Blinks or LED Stays OnTroubleshooting the ISP Connection Adsl linkWAN LED Green or Blinking Green WAN LED Blinking YellowObtaining a WAN IP Address WAN LED OffTroubleshooting PPPoE or PPPoA Troubleshooting Internet BrowsingTroubleshooting a TCP/IP Network Using a Ping Utility Testing the LAN Path to Your GatewayTesting the Path from Your PC to a Remote Device Ping -n 10 IP addressRestoring the Default Configuration and Password Problems with Date and TimeUsing the Default Reset button Appendix a Technical Specifications General SpecificationsLAN What is a Router? Appendix B Networks and Routing BasicsBasic Router Concepts Routing Information Protocol IP Addresses and the InternetClass E Class E addresses are for experimental use Netmask Subnet AddressingFigure B-2. Example of Subnetting a Class B Address Table B-1. Netmask Notation Translation Table for One Octet Single IP Address Operation Using NAT Private IP AddressesFigure B-3. Single IP Address Operation Using NAT MAC Addresses and Address Resolution Protocol Domain Name ServerIP Configuration by Dhcp Uplink Switches, Crossover Cables, and MDI/MDIX Switching Ethernet CablingCable Quality Glossary For example Internet Through the network Auto MDI/MDI-X1-4, 2-6, B-11, B-12 DMZ 1-3, 5-2 MDI/MDI-X1-4, 2-6, B-11, B-12 NTP 5-6 Xiii, B-7 1631 xiv, B-8