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NETGEAR CG814M Wireless Cable Modem Gateway CG814M CG814M Reference Manual

Netgear wireless cable modem gateway reference manual
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Reference Manual for the
Model CG814M Wireless

Cable Modem Gateway

NETGEAR, Inc.
4500 Great America Parkway
Santa Clara, CA 95054 USA
Phone 1-888-NETGEAR
SM-CG814MNA-0
September 2002

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Summary of Contents for NETGEAR CG814M Wireless Cable Modem Gateway CG814M CG814M

  • Page 1: Cable Modem Gateway

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway NETGEAR, Inc. 4500 Great America Parkway Santa Clara, CA 95054 USA Phone 1-888-NETGEAR SM-CG814MNA-0 September 2002...
  • Page 2 In the interest of improving internal design, operational function, and/or reliability, NETGEAR reserves the right to make changes to the products described in this document without notice. NETGEAR does not assume any liability that may occur due to the use or application of the product(s) or circuit layout(s) described herein.

  • Page 3: Customer Support

    Refer to the Support Information Card that shipped with your CG814M Wireless Cable Modem Gateway. World Wide Web NETGEAR maintains a World Wide Web home page that you can access at the universal resource locator (URL) http://www.netgear.com. A direct connection to the Internet and a Web browser such as Internet Explorer...

  • Page 5: Table Of Contents

    About This Manual ... xi Audience ... xi Typographical Conventions ... xi Special Message Formats ...xii Technical Support ...xii Chapter 1 Introduction ...1-1 About the CG814M Gateway ...1-1 Key Features ...1-1 Built-in Cable Modem ...1-1 A Powerful, True Firewall ...1-2 Content Filtering ...1-2 802.11b Standards-based Wireless Networking ...1-2 Configurable Auto Uplink™...
  • Page 6 Connecting the CG814M Gateway ...2-5 Connecting to Your Computer ...2-5 Ethernet ...2-6 USB ...2-6 Wireless ...2-7 Connecting to your Cable Service Provider ...2-7 Connecting the Power Adapter ...2-8 Log in to the Gateway ...2-8 Connecting the CG814M Gateway to the Internet ... 2-11 Configuration ...
  • Page 7 Viewing Gateway Status ...5-2 Connection Status ...5-4 Current System Time ...5-5 Configuring LAN IP Settings ...5-5 LAN IP Setup ...5-5 DHCP ...5-6 Use router as DHCP server ...5-6 Viewing and Emailing Logged Information ...5-7 Enabling Logs Event E-mail Notification ...5-8 Erasing Configuration ...5-8 Running Diagnostic Utilities ...5-9 Chapter 6...
  • Page 8 Single IP Address Operation Using NAT ... B-8 MAC Addresses and Address Resolution Protocol ... B-9 Related Documents ... B-9 Domain Name Server ... B-10 IP Configuration by DHCP ... B-10 Internet Security and Firewalls ... B-10 What is a Firewall? ...B-11 Stateful Packet Inspection ...B-11 Denial of Service Attack ...B-11 Wireless Networking ...
  • Page 9 What Is Your Configuration Information? ... C-9 Obtaining ISP Configuration Information for Windows Computers ... C-10 Obtaining ISP Configuration Information for Macintosh Computers ... C-11 Restarting the Network ... C-12 Glossary... G-1 Contents...
  • Page 10 Contents...

  • Page 11: About This Manual

    Thank your for purchasing the NETGEAR This manual describes the features of the gateway and provides installation and configuration instructions. Audience This reference manual assumes that the reader has intermediate to advanced computer and Internet skills. However, basic computer network, Internet, firewall, and VPN technologies tutorial information is provided in the Appendices.

  • Page 12: Special Message Formats

    Technical Support For help with any technical issues, contact Customer Support at 1-888-NETGEAR, or visit us on the Web at www.NETGEAR.com. The NETGEAR Web site includes an extensive knowledge base, answers to frequently asked questions, and a means for submitting technical questions online.

  • Page 13: Chapter 1 Introduction

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway Chapter 1 Introduction This chapter describes the features of the NETGEAR CG814M Wireless Cable Modem Gateway. About the CG814M Gateway The NETGEAR CG814M Wireless Cable Modem Gateway connects directly to the wide area network (WAN) using its built-in cable modem.

  • Page 14: A Powerful, True Firewall

    A Powerful, True Firewall Unlike simple Internet sharing NAT routers, the CG814M Gateway is a true firewall, using stateful packet inspection to defend against hacker attacks. Its firewall features include: • Denial of Service (DoS) protection Automatically detects and thwarts Denial of Service (DoS) attacks such as Ping of Death, SYN Flood, LAND Attack and IP Spoofing.

  • Page 15: Configurable Auto Uplink™ Ethernet Connection

    Configurable Auto Uplink™ Ethernet Connection With its internal 4-port 10/100 switch, the CG814M Gateway can connect to either a 10 Mbps standard Ethernet network or a 100 Mbps Fast Ethernet network. Both the local LAN and the Internet WAN interfaces are autosensing and capable of full-duplex or half-duplex operation. The gateway incorporates Auto Uplink automatically sense whether the Ethernet cable plugged into the port should have a ‘normal’...

  • Page 16: Easy Installation And Management

    Easy Installation and Management You can install, configure, and operate the CG814M Gateway within minutes after connecting it to the network. The following features simplify installation and management tasks: • Browser-based management Browser-based configuration allows you to easily configure your gateway from almost any type of personal computer, such as Windows, Macintosh, or Linux.

  • Page 17: What's In The Box

    • Support information card If any of the parts are incorrect, missing, or damaged, contact your NETGEAR dealer. Keep the carton, including the original packing materials, in case you need to return the product for repair. The Firewall’s Front Panel...
  • Page 18 You can use some of the LEDs to verify connections. the front panel of the CG814M Gateway. These LEDs are green when lit. Table 1-1. LED Descriptions Label Activity Power Test Cable Link On (Green) Cable Traffic Wireless Blink Local On (Green) (Local Area Blink (Green)

  • Page 19: The Gateway's Rear Panel

    The Gateway’s Rear Panel The rear panel of the CG814M Gateway Figure 1-2: CG814M Gateway Rear Panel Viewed from left to right, the rear panel contains the following elements: • AC power adapter input • 802.11b Wireless antenna • Factory Default Reset push button •...
  • Page 20 Reference Manual for the Model CG814M Wireless Cable Modem Gateway Introduction...

  • Page 21: Connecting The Gateway To The Internet

    Connecting the Gateway to the Internet This chapter describes how to set up the CG814M Gateway on your Local Area Network (LAN), connect to the Internet and perform basic configuration. What You Will Need Before You Begin You need to prepare these three things before you can connect your gateway to the Internet: A computer properly connected to the gateway as explained below.

  • Page 22: Lan Configuration Requirements

    LAN Configuration Requirements For the initial connection to the Internet and configuration of your gateway, you will need to connect a computer to the gateway which is set to automatically get its TCP/IP configuration from the gateway via DHCP. Note: Please refer to Appendix C, "Preparing Your Network"...
  • Page 23 • You may also refer to the CG814W Resource CD for the NETGEAR Router ISP Guide which provides Internet connection infromation for many ISPs. Once you locate your Internet configuration parameters, you may want to record them on the page below.

  • Page 24: Record Your Internet Connection Information

    Record Your Internet Connection Information Print this page. Fill in the configuration parameters from your Internet Service Provider (ISP). Fixed or Static IP Address: If you have a static IP address, record the following information. For example, 169.254.141.148 could be a valid IP address. Fixed or Static Internet IP Address: ______ .

  • Page 25: Connecting The Cg814M Gateway

    Connecting the CG814M Gateway Before using your modem, you need to do the following: • Connect to your computer, using either Ethernet, USB or wireless (see • Connect the line from your cable service provider to the cable port of the gateway (see 2-7).

  • Page 26: Ethernet

    Ethernet To connect your computer to the modem via Ethernet: Locate the Category 5 Ethernet cable which came with your modem. Connect your computer to the modem using the Ethernet cable.: Note: Note: The CG814M Gateway incorporates Auto Uplink LOCAL Ethernet port will automatically sense whether the cable plugged into the port should have a 'normal' connection (e.g.

  • Page 27: Wireless

    The found new hardware Windows installation wizard will prompt you for the drivers. Browse to the CD and install the USB driver by clicking through the Windows wizard prompts. Wireless Detailed instructions on configuring your wireless devices for TCP/IP networking are provided in the next chapter.

  • Page 28: Connecting The Power Adapter

    Connecting the Power Adapter To connect the power adapter to the gateway: Plug the connector of the power adapter into outlet on the rear panel of the modem. Plug the other end of the adapter into an AC power outlet. Verify that the PWR LED on the modem is lit.
  • Page 29 Now that the gateway, and the computer are turned on, verify the following: • When power on the gateway was first turned on, the PWR light went on, the numbered LAN LEDs turned on for a few seconds. • The gateway’s LOCAL LINK/ACT lights are lit for any computers that are connected to •...
  • Page 30 For security reasons, the gateway has its own user name and password. When prompted, enter for the gateway User Name and admin letters.. Note: The user name and password are not the same as any user name or password you may use to log in to your Internet connection.

  • Page 31: Connecting The Cg814M Gateway To The Internet

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway Connecting the CG814M Gateway to the Internet The gateway is now properly attached to your network. You are ready to configure your gateway to connect to the Internet. To continue installation, click on the Basic Settings menu, shown in Figure 2-5..
  • Page 32 A DNS server is a host on the Internet that translates Internet names (such as www.netgear.com) to numeric IP addresses. Typically your ISP transfers the IP address of one or two DNS servers to your gateway during login. If the ISP does not transfer an address, you must obtain it from the ISP and enter it manually here.
  • Page 33 Firewall Protection: Normally firewall protection should be enabled to protect your network from attacks from the internet. Removing the check from the “Firewall Protection” box disables your firewall. Click Apply to save your settings. Connecting the Gateway to the Internet 2-13...
  • Page 34 Reference Manual for the Model CG814M Wireless Cable Modem Gateway 2-14 Connecting the Gateway to the Internet...

  • Page 35: Wireless Configuration

    Unlike wired network data, your wireless data transmissions can extend beyond your walls and can be received by anyone with a compatible adapter. For this reason, NETGEAR strongly recommends that you make use of the security features of your wireless equipment. As a minimum security precaution, you should change the SSID setting of all devices on your network from the factory setting to a unique password.

  • Page 36: Placement And Range

    Placement and Range The operating distance or range of your wireless connection can vary significantly based on the physical placement of the wireless gateway. For best results, place your gateway: • near the center of the area in which your PCs will operate, •...

  • Page 37: Restricting Wireless Access By Mac Address

    Enter a Service Set ID (SSID) value of up to 32 alphanumeric characters. The same SSID must be assigned to all wireless devices in your network. The default SSID is Wireless, but NETGEAR strongly recommends that you change your network’s SSID to a different value. •...

  • Page 38: Configuring Wired Equivalent Privacy (Wep)

    The Wireless Access window displays a list of MAC addresses that will be allowed to connect to the gateway. These PCs must also have the correct SSID and WEP settings. To restrict access based on MAC addresses: Click the Add button to go to the Add/Edit menu. For your convenience, this menu displays a list of currently active wireless cards and their MAC addresses.
  • Page 39 • Automatic - Enter a word or group of printable characters in the Passphrase box and click the Generate button. The four key boxes will be automatically populated with key values. • Manual - Enter ten hexadecimal digits (any combination of 0-9, a-f, or A-F) Select which of the four keys will be active.
  • Page 40 Reference Manual for the Model CG814M Wireless Cable Modem Gateway Wireless Configuration...

  • Page 41: Protecting Your Network

    Note: The user name and password are not the same as any user name or password your may use to log in to your Internet connection. NETGEAR recommends that you change this password to a more secure password. The ideal password should contain no dictionary words from any language, and should be a mixture of both upper and lower case letters, numbers, and symbols.

  • Page 42: Blocking Keywords, Sites, And Services

    From the Main Menu of the browser interface, under the Maintenance heading, select Set Password to bring up the menu shown in To change the password, first enter the old password, and then enter the new password twice. If you would like to reset your gateway to its factory default settings select Yes for Restore Factory Defaults.

  • Page 43: Block Keywords And Domains

    A domain name is the name of a particular web site. For example, for the address www.NETGEAR.com, the domain name is NETGEAR.com. Log in to the gateway at its default LAN address of http://192.168.0.1 with its default User Name...
  • Page 44 Click on the Block Sites link of the Content Filtering menu. To enable keyword blocking or Domain Blocking, check the appropriate Enable box. Figure 4-3: Block Sites menu Protecting Your Network...

  • Page 45: Blocking Services

    Enter Keywords into the Keyword List by typing then in the Add Keyword box, then, click Add Keyword. Some examples of Keyword applications follow: • If the keyword “XXX” is specified, the URL <http://www.badstuff.com/xxx.html> is blocked. • If the keyword “.com” is specified, only websites with other domain suffixes (such as .edu or .gov) can be viewed.

  • Page 46: Port Blocking

    Most web surfing is done on port 80. The parental control feature monitors port 80 so proxy based web surfing would not be inspected by the parental controls. The proxy filter should be used if parental controls are being used. Cookies A cookie is a text file saved by your web browser which is sent to a particular web servier every time you visit the site.

  • Page 47: Port Forwarding

    rule you have defined. To configure outbound rules on the CG814M Gateway, click the Port Blocking link on the Advanced section of the main menu. • To block outbound traffic, select the service you would like to block from the drop-down list of predefined services.
  • Page 48 only one IP address to the Internet, and outside users cannot directly address any of your local computers. However, by defining an inbound rule you can make a local server (for example, a web server or game server) visible and available to the Internet. The rule tells the gateway to direct inbound traffic for a particular service to one local server based on the destination port number.

  • Page 49: Considerations For Port Forwarding

    Select the service you would like to forward from the drop-down list of predefined services. If the service you would like to forward is not in the predefined list, you can add a custom service. Enter the range of ports you would like to forward and select whether the ports are TCP, UDP or Both.
  • Page 50 changed. Port Triggering monitors outbound traffic. When the gateway detects traffic on the specified outbound port, it remembers the IP address of the computer that sent the data and “triggers” the incoming port. Incoming traffic on the triggered port is then forwarded to the triggering computer. An example of Port Triggering for Internet Relay Chat (IRC) is shown in connect to an IRC server, the server tries to connect back on port 113 to do an Ident lookup.

  • Page 51: Setting Up A Default Dmz Host

    In the Trigger Range, enter the outbound ports that will be monitored for activity. This will be the “trigger”. In the Targe Range, enter the inbound ports that should be forwarded when the trigger occurs. Select the appropriate protocol: TCP, UDP or Both. Check the Enable box Click Apply To clear a Port Triggering rule, you can either remove the check from the Enable box, to...
  • Page 52 Reference Manual for the Model CG814M Wireless Cable Modem Gateway WAN Port’ check box. This should only be used as a diagnostic tool, since it allows your gateway to be discovered. Don't check this box unless you have a specific reason to do so. 4-12 Protecting Your Network...

  • Page 53: Managing Your Network

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway Chapter 5 Managing Your Network This chapter describes how to perform network management tasks with your CG814M Wireless Cable Modem Gateway. Network Status Information The CG814M provides a variety of status and usage information which is discussed below. Managing Your Network...

  • Page 54: Viewing Gateway Status

    Viewing Gateway Status From the Main Menu, under Maintenance, select Gateway Status to view the screen in This screen shows the following parameters: Table 5-1. Menu 3.2 - Router Status Fields Field Information Standard Specification Compliant Hardware Version Software Version Cable Modem MAC Address The MAC address being used by the Cable Modem port of the gateway.
  • Page 55 Table 5-1. Menu 3.2 - Router Status Fields Field CM Certificate Status System Up Time Network Access Cable Modem IP Address Managing Your Network Description If the Cable Modem certificate is Installed, it is possible for the service provider to upgrade your Data Over Cable service securely. This is the time since the gateway has registered with your cable service provider.

  • Page 56: Connection Status

    Connection Status From the Main Menu, under Maintenance, select Connection to view the screen in This screen shows detailed information about the status of the connection to your cable service provider that can be used for troubleshooting. The gateway goes through the following steps to be provisioned Acquire and lock Downstream Channel Acquire upstream parameters and range.

  • Page 57: Current System Time

    Current System Time The date and time is acquired from your cable service provider as part of the registration procedure. Configuring LAN IP Settings The LAN IP Setup menu allows configuration of LAN IP services such as the IP address of the gateway and DHCP.

  • Page 58: Dhcp

    DHCP By default, the gateway will function as a DHCP (Dynamic Host Configuration Protocol) server, allowing it to assign IP, DNS server, and default gateway addresses to all computers connected to the router's LAN. The assigned default gateway address is the LAN address of the gateway. IP addresses will be assigned to the attached PCs from a pool of addresses specified in this menu.

  • Page 59: Viewing And Emailing Logged Information

    Viewing and Emailing Logged Information The gateway will log security-related events such as denied incoming service requests, hacker probes, and administrator logins. If you enabled content filtering, the Logs page shows you when someone on your network tried to access a blocked site. You can enable e-mail notification to receive these logs in an e-mail message.

  • Page 60: Enabling Logs Event E-Mail Notification

    Enabling Logs Event E-mail Notification In order to receive logs and alerts by e-mail, you must provide your e-mail information in the E-Mail section of the Logs menu: • In the Contact Email Address, type the e-mail address to which the logs will be sent. Use a full e-mail address (for example, ChrisXY@myISP.com).

  • Page 61: Running Diagnostic Utilities

    Running Diagnostic Utilities The CG814M Gateway has a diagnostics feature. You can use the diagnostics menu to test connectivity to PC using the Ping command: From the Main Menu of the browser interface, under the Maintenance heading, select the Diagnostics menu, shown in To perform a Ping test In the Ping Target section, enter the IP address of the PC you would like to ping.
  • Page 62 Reference Manual for the Model CG814M Wireless Cable Modem Gateway 5-10 Managing Your Network...

  • Page 63: Chapter 6 Troubleshooting

    This chapter gives information about troubleshooting your CG814M Wireless Cable Modem Gateway. For the common problems listed, go to the section indicated. • Is the gateway on? • Have I connected the gateway correctly? Go to “Basic Functions“ on page •...

  • Page 64: Power Led Not On

    • Check that you are using the 12VDC power adapter supplied by NETGEAR for this product. If the error persists, you have a hardware problem and should contact technical support.

  • Page 65: Cable Link Led Not On

    Cable Link LED Not On If the Cable Link LED does not light when connected to your cable television cable, check the following: • Make sure that the coaxial cable connections are secure at the gateway and at the wall jack. •...

  • Page 66: Troubleshooting The Isp Connection

    • Make sure you are using the correct login information. The factory default login name is admin and the password is password. Make sure that CAPS LOCK is off when entering this information. If the gateway does not save changes you have made in the Web Configuration Interface, check the following: •...

  • Page 67: Testing The Path From Your Pc To A Remote Device

    ping 192.168.0.1 Click on OK. You should see a message like this one: Pinging <IP address> with 32 bytes of data If the path is working, you see this message: Reply from < IP address >: bytes=32 time=NN ms TTL=xxx If the path is not working, you see this message: Request timed out If the path is not functioning correctly, you could have one of the following problems:...
  • Page 68 — Check that your PC has the IP address of your gateway listed as the default gateway. If the IP configuration of your PC is assigned by DHCP, this information will not be visible in your PC’s Network Control Panel. Verify that the IP address of the gateway is listed as the default gateway as described in —...

  • Page 69: Technical Specifications

    This appendix provides technical specifications for the CG814M Wireless Cable Modem Gateway. Network Protocol and Standards Compatibility Data and Routing Protocols: Power Adapter North America (input): All regions (output): Physical Specifications Dimensions: Weight: Environmental Specifications Operating temperature: Operating humidity: Electromagnetic Emissions Meets requirements of: Interface Specifications Technical Specifications...
  • Page 70 Local: Internet: 10BASE-T or 100BASE-Tx, RJ-45 USB 1.1 Function 802.11b Wireless Access Point DOCSIS 1.0, upgradeable to DOCSIS 1.1 Technical Specifications...

  • Page 71: Networks, Routing, And Firewall Basics

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway Appendix B Networks, Routing, and Firewall Basics This chapter provides an overview of IP networks, routing, and firewalls. Related Publications As you read this document, you may be directed to various RFC documents for further information.

  • Page 72: What Is A Router

    What is a Router? A router is a device that forwards traffic between networks based on network layer information in the data and on routing tables maintained by the router. In these routing tables, a router builds up a logical picture of the overall network by gathering and exchanging information with other routers in the network.
  • Page 73 The latter version is easier to remember and easier to enter into your computer. In addition, the 32 bits of the address are subdivided into two parts. The first part of the address identifies the network, and the second part identifies the host node or station on the network. The dividing point may vary depending on the address range and the application.

  • Page 74: Netmask

    • Class C Class C addresses can have 254 hosts on a network. Class C addresses use 24 bits for the network address and eight bits for the node. They are in this range: 192.0.1.x to 223.255.254.x. • Class D Class D addresses are used for multicasts (messages sent to many hosts).

  • Page 75: Subnet Addressing

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway As a shorter alternative to dotted-decimal notation, the netmask may also be expressed in terms of the number of ones from the left. This number is appended to the IP address, following a backward slash (/), as “/n.”...
  • Page 76 Although the preceding example uses the entire third octet for a subnet address, note that you are not restricted to octet boundaries in subnetting. To create more network numbers, you need only shift some bits from the host address to the network address. For instance, to partition a Class C network number (192.68.135.0) into two, you shift one bit from the host address to the network address.

  • Page 77: Private Ip Addresses

    255.255.255.248 255.255.255.252 255.255.255.254 255.255.255.255 NETGEAR strongly recommends that you configure all hosts on a LAN segment to use the same netmask for the following reasons: • So that hosts recognize local IP broadcast packets When a device broadcasts to its segment neighbors, it uses a destination address of the local network address with all ones for the host address.

  • Page 78: Single Ip Address Operation Using Nat

    Single IP Address Operation Using NAT In the past, if multiple PCs on a LAN needed to access the Internet simultaneously, you had to obtain a range of IP addresses from the ISP. This type of Internet account is more costly than a single-address account typically used by a single user with a modem, rather than a router.

  • Page 79: Mac Addresses And Address Resolution Protocol

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway This scheme offers the additional benefit of firewall-like protection because the internal LAN addresses are not available to the Internet through the translated connection. All incoming inquiries are filtered out by the router. This filtering can prevent intruders from probing your system.

  • Page 80: Domain Name Server

    Many of the resources on the Internet can be addressed by simple descriptive names such as www.NETGEAR.com. This addressing is very helpful at the application level, but the descriptive name must be translated to an IP address in order for a user to actually contact the resource. Just as...

  • Page 81: What Is A Firewall

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway What is a Firewall? A firewall is a device that protects one network from another, while allowing communication between the two. A firewall incorporates the functions of the NAT router, while adding features for dealing with a hacker intrusion or attack.

  • Page 82: Wireless Networking

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway Wireless Networking The CG814M Gateway conforms to the Institute of Electrical and Electronics Engineers (IEEE) 802.11b standard for wireless LANs (WLANs). On an 802.11b wireless link, data is encoded using direct-sequence spread-spectrum (DSSS) technology and is transmitted in the unlicensed radio spectrum at 2.5GHz.

  • Page 83: Extended Service Set Identification (Essid

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway In the infrastructure mode, the wireless access point converts airwave data into wired Ethernet data, acting as a bridge between the wired LAN and wireless clients. Connecting multiple Access Points via a wired Ethernet backbone can further extend the wireless network coverage. As a mobile computing device moves out of the range of one access point, it moves into the range of another.

  • Page 84: Wireless Channel Selection

    The 128-bit WEP data encryption method consists of 104 user-configurable bits. Similar to the forty-bit WEP data encryption method, the remaining 24 bits are factory set and not user configurable. Some vendors allow passphrases to be entered instead of the cryptic hexadecimal characters to ease encryption key entry.

  • Page 85: Ethernet Cabling

    Note: The available channels supported by the wireless products in various countries are different. The preferred channel separation between the channels in neighboring wireless networks is 25 MHz (5 channels). This means that you can apply up to three different channels within your wireless network.

  • Page 86: Cable Quality

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway are exchanged at one of the two cable connectors. Crossover cables are often unmarked as such, and must be identified by comparing the two connectors. Since the cable connectors are clear plastic, it is easy to place them side by side and view the order of the wire colors on each.

  • Page 87: Appendix C Preparing Your Network

    This appendix describes how to prepare your network to connect to the Internet through the CG814M Wireless Cable Modem Gateway and how to verify the readiness of broadband Internet service from an Internet service provider (ISP). Note: If an ISP technician configured your computer during the installation of a broadband modem, or if you configured it using instructions provided by your ISP, you may need to copy the current configuration information for use in the configuration of your gateway.

  • Page 88: Configuring Windows 95, 98, And Me For Tcp/Ip Networking

    • All versions of UNIX or Linux include TCP/IP components. Follow the instructions provided with your operating system or networking software to install TCP/IP on your computer. In your IP network, each PC and the gateway must be assigned a unique IP addresses. Each PC must also have certain other IP configuration information such as a subnet mask (netmask), a domain name server (DNS) address, and a default gateway address.
  • Page 89 You must have an Ethernet adapter, the TCP/IP protocol, and Client for Microsoft Networks. Note: It is not necessary to remove any other network components shown in the Network window in order to install the adapter, TCP/IP, or Client for Microsoft Networks.

  • Page 90: Enabling Dhcp To Automatically Configure Tcp/Ip Settings

    If you need Client for Microsoft Networks: Click the Add button. Select Client, and then click Add. Select Microsoft. Select Client for Microsoft Networks, and then click OK. Restart your PC for the changes to take effect. Enabling DHCP to Automatically Configure TCP/IP Settings After the TCP/IP protocol components are installed, each PC must be assigned specific information about itself and resources that are available on its network.

  • Page 91: Verifying Tcp/Ip Properties

    From the drop-down box, select your Ethernet adapter. The window is updated to show your settings, which should match the values below if you are using the default TCP/IP settings that NETGEAR recommends: • The IP address is between 192.168.0.2 and 192.168.0.254 •...

  • Page 92: Verifying Tcp/Ip Properties

    A command window opens Type ipconfig /all Your IP Configuration information will be listed, and should match the values below if you are using the default TCP/IP settings that NETGEAR recommends: • The IP address is between 192.168.0.2 and 192.168.0.254 •...

  • Page 93: Macos X

    The TCP/IP Control Panel opens: From the “Connect via” box, select your Macintosh’s Ethernet interface. From the “Configure” box, select Using DHCP Server. You can leave the DHCP Client ID box empty. Close the TCP/IP Control Panel. Repeat this for each Macintosh on your network. MacOS X From the Apple menu, choose System Preferences, then Network.

  • Page 94: Verifying Tcp/Ip Properties For Macintosh Computers

    TCP/IP Control Panel. From the Apple menu, select Control Panels, then TCP/IP. The panel is updated to show your settings, which should match the values below if you are using the default TCP/IP settings that NETGEAR recommends: •...

  • Page 95: Verifying The Readiness Of Your Internet Account

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway Verifying the Readiness of Your Internet Account For broadband access to the Internet, you need to contract with an Internet service provider (ISP) for a single-user Internet access account using a cable modem. For a single-user Internet account, your ISP supplies TCP/IP configuration information for one computer.

  • Page 96: Obtaining Isp Configuration Information For Windows Computers

    • An IP address and subnet mask • A gateway IP address, which is the address of the ISP’s router • One or more domain name server (DNS) IP addresses • Host name and domain suffix For example, your account’s full server names may look like this: mail.xxx.yyy.com In this example, the domain suffix is If any of these items are dynamically supplied by the ISP, your gateway automatically acquires...

  • Page 97: Obtaining Isp Configuration Information For Macintosh Computers

    If an IP address appears under Installed Gateways, write down the address. This is the ISP’s gateway address. Select the address and then click Remove to remove the gateway address. Select the DNS Configuration tab. If any DNS server addresses are shown, write down the addresses. If any information appears in the Host or Domain information box, write it down.

  • Page 98: Restarting The Network

    Reference Manual for the Model CG814M Wireless Cable Modem Gateway Restarting the Network Once you’ve set up your computers to work with the gateway, you must reset the network for the devices to be able to communicate correctly. Restart any computer that is connected to the firewall. After configuring all of your computers for TCP/IP networking and restarting them, and connecting them to the local network of your CG814M Gateway, you are ready to access and configure the gateway.

  • Page 99: Glossary

    Domain names are of the form of a registered entity name plus one of a number of predefined top level suffixes such as .com, .edu, .uk, etc. For example, in the address mail.NETGEAR.com, mail is a server name and NETGEAR.com is the domain.
  • Page 100 Gateway A local device, usually a router, that connects hosts on a local network to other networks. IETF Internet Engineering Task Force. An open international community of network designers, operators, vendors, and researchers concerned with the evolution of the Internet architecture and the smooth operation of the Internet. Working groups of the IETF propose standard protocols and procedures for the Internet, which are published as RFCs (Request for Comment) at www.ietf.org.
  • Page 101 See Network Address Translation. netmask A number that explains which part of an IP address comprises the network address and which part is the host address on that network. It can be expressed in dotted-decimal notation or as a number appended to the IP address.
  • Page 102 Virtual Private Network. A method for securely transporting data between two private networks by using a public network such as the Internet as a connection. See wide area network. Wired Equivalent Privacy. WEP is a data encryption protocol for 802.11b wireless networks.

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