NETGEAR CG814WG manuale d’uso

SM-CG814WGNA-Comcast-0 October 2003 NETGEAR , Inc. 4500 Great America Parkway Santa Clara, CA 95054 USA Phone 1-888-NETGEAR Hardware Manual for the Model CG814WG Wireless Cable Modem Gateway[...]

ii © 2003 by NETGEAR, Inc. All rights reserved. T rademarks NETGEAR is a tr ademark of Netge ar , Inc. Microsoft, W indows, and W indows are register ed trademarks of Microsoft Corporation. Other brand and product names are registered tradem arks or trademarks of their respective holders. St atement of Conditions In the interest of improving inter[...]

iii test transmitte rs) in accordance with the regul ations may , ho wever , be subject to certain re strictions. Please refer to the notes in the operating instructions. Federal Of fice for T elecommuni cations Ap provals has been notified of the placing of this equipment on the market and has been granted the right to test the series for complian[...]

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Contents v Content s About This Manual ..... ................................................................ ................. ............ ........... .. . ix Audience ............. ................ ................ ............. ................ ................ ................ ............ ..... ix T ypographical Conventions ................ .[...]

vi Contents DHCP Configuration of TCP/IP in Window s 2000 .... ................... .................... ...... 2-1 1 V erifying TCP/IP Properties for W indows XP and 2000 ......... ................... ............. 2-14 V erifying the Readiness of Y our Internet Ac count .............. ................ ................ .......... 2-15 Are Login Pro[...]

Contents vii Basic Router Concepts .................... ................ ................ ................ ................ .............. D-1 What is a Router? .............. ................ ................ ................. ................ ................ .... D-2 Routing Information Protocol .................. ... ......... .................[...]

viii Contents[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway About This Manual ix About This Manual Thank your for purcha sing the NETGEAR ™ CG814WG W ireless Cable Modem Gateway. This manual describes the features of the gatewa y and provides installation and configuration instructions. Audience This reference manual assumes that the read[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway x About This Manual S pecial Message Format s This guide uses the following format s to highlight special messages: Note: This format is used to highlight inform ation of importance or special interest. Wa r n i n g : This format is used to highlight inform ation about the possibil[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Hardware Overview 1-1 Chapter 1 Hardware Overview This chapter describes the features of the NETGEAR CG814WG W ireless Cable Modem Gateway. About the CG814WG The NETGEAR CG814WG W ire less Cable Modem Gateway connects di rectly to the wide area network (W AN) using its built-in cab[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 1-2 Hardware Overview • Automatically detects and thwarts attacks such as Ping of Death, SYN Flood, LAND Attack and IP Spoofing. • Configurable Port Forwarding, Port Bloc king, Port T rigge ring and DMZ provide enough flexibility for most applications. • Blocks access from yo[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Hardware Overview 1-3 USB Port A USB connection for your computer eliminates the need for installin g an Ethernet card. Protocol Support The CG814WG supports t he T ransmission Control P rotocol/Internet Protocol (TCP /IP). Appendix D, "Netwo rks, Routing, and F irewall Basics[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 1-4 Hardware Overview • V isual monitoring The gateway’ s front panel LEDs provide an e asy way to monitor its status and activity .[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Hardware Overview 1-5 What’ s in the Box? The product package should contain the following it ems: • CG814WG W ireless Cable Modem Gateway •A C p o w e r a d a p t e r • Category 5 (CA T5) Ethernet cable • USB cable • Resour ce CD , including: — This manual — Applic[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 1-6 Hardware Overview Te s t O n Off A system failure has occurred. Re boot the gateway. Normal operation. Cable Link On (Green) Off Configuration of the cable interfa ce by your cable service provider is complete. Configuration of the cable interface is still i n progress. Cable D[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Hardware Overview 1-7 The Gateway’ s Rear Panel The rear panel of the CG81 4WG ( Figure 1-2 ) contains t he connections identified below . Figure 1-2: CG814WG Rear Panel V iewed from left to right, the rear panel contains the following elements: • 802.1 1g W ireless anteenna ?[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 1-8 Hardware Overview[...]

Preparing Your Netwo rk 2-1 Chapter 2 Prep aring Y our Network This appendix describes how to prepare your ne twork to connect to the Internet through the CG814WG W ireless Cable Modem Gateway and ho w to verify the readiness of broadband Internet service from an Inte rnet service provider (ISP). Prep aring Y our Computers for TCP/IP Networking Com[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 2-2 Prepa ring Your Ne twork • Subnet mask —255.255.25 5.0 • Gateway address (the gateway)—192.168.0.1 These addresses are part of the IETF-designated private addres s range for use in private networks. Configuring Windows 98 SE and Me for TCP/IP Networking As part of the P[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Preparing Your Netwo rk 2-3 Y ou must have an Ethernet adapter , the TCP/IP protocol, and Client for M icrosoft Networks. If you need to install a ne w adapter , follow these steps: a. Click the Add button. b. Select Adapter , and then click Add. c. Select the manufacturer and mode[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 2-4 Prepa ring Your Ne twork If you need Client for Micro soft Networks: a. Click the Add button. b. Select Client, and then click Ad d. c. Select Microsoft. d. Select Client for Microsoft Networks, and then click OK. 3. Restart your PC for the changes to take ef fect. Enabling DHC[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Preparing Your Netwo rk 2-5 V erify the following settings as shown: • Client for Microsoft Network exists • Ethernet adapter is present • TCP/IP is present • Primary Network Logon is set to W indows logon Click on the Properties button. The following TCP/IP Properties wind[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 2-6 Prepa ring Your Ne twork Selecting Windows’ In ternet Access Method 1. On the W indows taskbar, click the S tart button, point to Settings, and th en click Control Panel. 2. Double-click the Internet Options icon. 3. Select “I want to set up my Int ernet connectio n manuall[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Preparing Your Netwo rk 2-7 2. Ty p e winipcfg , and then click OK. The IP Configuration window opens, which lists (a mong other things), your IP address, subnet mask, and default gateway . 3. From the drop-down box, select your Ethernet adapter . The window is updated to show your[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 2-8 Prepa ring Your Ne twork DHCP Configuration of TCP /IP in Windows XP or 2000 Y ou will find there are many similarities in th e procedures for different W indows systems whe n using DHCP to configure TCP/IP . The following steps will walk you through the configura tion process [...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Preparing Your Netwo rk 2-9 Now the Network Connection window displays. The Connections List that shows all the network connections set up on the PC, located to the right of the window . • Right-click on the Connection with the wireless icon and choose St a t u s . Now you should[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 2-10 Preparing Your Network The TCP/IP details are presented on the Support tab page. • Select Internet Protocol, and click Properties to view the co nfiguration information .[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Preparing Your Netwo rk 2-1 1 DHCP Configuration of TC P/IP in Windows 2000 Once again, after you have installed the network card, TCP/IP for W indows 2000 is con figured. TCP/IP should be added by de fault and set to DHCP without your having to configure it. However , if there are[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 2-12 Preparing Your Network • Click on the My Network Places icon on the W indows desktop. This will bring up a window called Network a nd Dial-up Conn ections. • Right click on Local Ar ea Connection and select Properties . The Local Area Connection Pr operties dialog box appe[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Preparing Your Netwo rk 2-1 3 • W ith Internet Protocol (TCP/IP) selected, click on Properties to open the Internet Protocol (TCP/IP) Properties dialogue box. V erify that – Obtain an IP address automatically is selected. – Obtain DNS server address automatically is selected.[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 2-14 Preparing Your Network V erifying TCP/IP Properti es for Windows XP and 2000 T o check your PC’ s TCP/IP configuration: 1. On the W indows taskbar , click the Start button, and then click Run. The Run window opens. 2. Ty p e cmd and then click OK. A command window opens 3. T[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Preparing Your Netwo rk 2-1 5 V erifying the Readiness of Y our 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 or DSL mode m. This modem must be a sepa[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 2-16 Preparing Your Network • 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 suf fix For example, your account’ s full server na mes may look like[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Preparing Your Netwo rk 2-1 7 If an IP address appears under Installed Gatewa ys, write down the address. This is the ISP’ s gateway address. Select the address and then click Remove to remove the gateway address. 6. Select the DNS Configuration tab. If any DNS server addresses a[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway 2-18 Preparing Your Network[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Troubleshooting A-1 Appendix A T roubleshooting This chapter gives informatio n about troubleshooting your CG814WG W ireless 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 ?[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway A-2 Troubleshooting – The Internet Link port LED is lit. If any of these conditions does not occur , refer to the appropriate following section. Power LED Not On If the Power and other LEDs are off wh en your gateway is turned on: • Make sure that the power cord is properly con[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Troubleshooting A-3 Cable Link LED Not On If the Cable Link LED does not lig ht when connected to your ca ble television cable, check the following: • Make sure that the coaxial cable connections ar e secure at the gateway and at the wall jack. • Make sure that your cable inter[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway A-4 Troubleshooting ping 192.168.0.1 3. Click on OK. Y ou should see a message like this one: Pinging <IP address> with 32 bytes o f 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[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Troubleshooting A-5 — 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 vi sible in your PC’ s Network Control Panel. V erify that the IP address of the gat[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway A-6 Troubleshooting[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Glossary B-1 Appendix B Glossary 10BASE-T IEEE 802.3 specification for 10 Mbps Ethernet over twisted pair wiring. 100BASE-Tx IEEE 802.3 specification for 100 Mbps Ethernet over twisted pair wiring. 802.1 1b, 802.1 1g IEEE specification for wireless networki ng at 1 1 Mbps (802.11b)[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway B-2 Glossary IETF Internet Engin eering T ask Force. An open international community of network designers, oper ators, vendors, and research ers concerned with the evolution of the Internet architecture a nd the smooth operation of t he Internet. W orking groups o f the IETF propos[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Glossary B-3 p acket A block of information sent over a network. A packet typically contains a source and destination network address, so me protocol and length information, a block of data, and a checksum. PPP See Point-to-Point Pr otocol. Point-to-Point Protocol PPP . A prot ocol[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway B-4 Glossary[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Configuring Wireless Security in Windows XP C-1 Appendix C Configuring Wireless Security in W indows XP This section describes how to configure basic wireless security on your W ireless Local Area Network (WLAN) when using Windows XP . What Y ou Will Need Before Y ou Begin Y ou nee[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway C-2 Configuring Wireless Security in Windows XP T wo Basic Operating Modes The CG814WG Gateway, li ke all 802.1 1 adapters , can operate in the following two basic modes: • Infrastructure Mod e : An 802.1 1 networking framework in which devices and computers communicate with each[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Configuring Wireless Security in Windows XP C-3 CG814WG Default Wireless Configuration Settings If this is a new wireless network installation, use the factory default settings to set up the network and verify wireless connectivity . If this is an ad dition to an existing wireless [...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway C-4 Configuring Wireless Security in Windows XP Basic Inst allation Instructions Use the procedure below th at corresponds to the version of W indows you are using. For Windows XP Users Inst alling a CG814WG Install the CG814WG driver and configuration utility softwar e. a. Power o[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Configuring Wireless Security in Windows XP C-5 Install the CG814WG Wir eless Cable Modem Gateway. a. Locate an availab le CardBus slot on the side of your notebook. Hold the PC Card with the Netgear logo facing up and insert it into the CardBus slot. The Found New Hardware W i zar[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway C-6 Configuring Wireless Security in Windows XP Configur e your CG814WG. a. Right click on the network icon in the W indows XP system tray to open the network options menu. b. Click on the V iew A vailable W ireless Networks menu item. c. If there is more than one wireless network [...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Configuring Wireless Security in Windows XP C-7 V erify wir eless connectivity to your network. a. Open the CG814WG utility by clicking on the icon in the W indows system tray . b. V erify that your Connection and Status Monitor information ma tches your wireless network. c. Check [...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway C-8 Configuring Wireless Security in Windows XP Wireless Connection Indicators The NETGEAR wireless adapters provide the indicators which give you feedb ack on the status of your wireless connection: • LEDs on the wireless adapter indicat e the condition of wireless link. • The[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Configuring Wireless Security in Windows XP C-9 Interpreting System T ray Icon Colors The System T ray (SysT ray) resides on one end o f the taskbar in the Micro soft W indows desktop. Color Condition Description Red The wireless PC Card has no connection to any other wireless node[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway C-10 Configuring Wireless Security in Windows XP Basic T roubleshooting Tip s If you have problems connected to your wireless network, try the tips below . Also, for problems with accessing netw ork resources, the W indows software might not be installed and configured properly on [...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics D-1 Appendix D 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 dire cte d to various RFC documents for further informat[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway D-2 Networks, Routing, and Firewall Basics 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 main tained by the router . In these rou ting tables, a router builds up a logical picture o[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics D-3 The latter version is easier to remember and easier to enter into your computer . In addition, the 32 bits of the ad dress are subdivided into two part s. The firs t part of the address identifies the network, and the seco nd part identifi[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway D-4 Networks, Routing, and Firewall Basics • Class C Class C addresses can have 254 hosts on a netw ork. Class C addre sses 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 [...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics D-5 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 ap pended to the IP address, following a backward slash (/), as “/n.” In the example, t[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway D-6 Networks, Routing, and Firewall Basics Although the preceding example uses the entire third octet for a subnet address, note that you are not restricted to octet boundaries in subnetting. T o create more network numbers, you need only shift some bits from the host a ddress to t[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics D-7 NETGEAR strongly recommends that you configur e all hosts on a LAN se gment to use the same netmask for the following reasons: • So that hosts recognize local IP broadcast packets When a device broadcasts to its segment neighb ors, it us[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway D-8 Networks, Routing, and Firewall Basics Figure D-3: Single IP Address Op eration Using NA T This scheme offers t he additional benefit of firewall -like protection because the internal LAN addresses are not available to the Internet thro ugh the translated connection. All incomi[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics D-9 If a device sends data to another station on the network and the destination MAC address is not yet recorded, ARP is used. An ARP request is broadcast onto the network. All stations on the network receive and read the reque st. The destina[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway D-10 Networks, Routing, and Firewall Basics IP Configuration by DHCP When an IP-based local area networ k is installed, each PC must be configured with an IP a ddress. If the PCs need to access the Intern et, they should also be config ured with a gateway address and one or more DN[...]

Hardware Manual for the Mo del CG814WG Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics D-1 1 S t ateful Pac ket Inspection Unlike simple Internet sharing rout ers, a firewall uses a process ca ll ed stateful packet inspection to ensure secure firewall filtering to protect your network from attacks and intrusions. Since user-leve[...]

Hardware Manual for the Model CG81 4WG Wireless Cable Modem Gateway D-12 Networks, Routing, and Firewall Basics transmit pair must be exchanged with the receive pair . This exc hange is done by one of two mechanisms. Most hubs provide an Uplink switc h which will exchange th e pairs on one port, allowing that port to be connected to anothe r hub us[...]