NETGEAR CG814M Wireless Cable Modem Gateway CG814M CG814M manuale d’uso

SM-CG814MNA-0 September 2002 NETGEAR , Inc. 4500 Great America Parkway Santa Clara, CA 95 054 USA Phone 1-888-NETGEAR Reference Manual for the Model CG814M Wireless Cable Modem Gateway[...]

ii © 2002 by NETGEAR, Inc. All rights reserved. T rademarks NETGEAR is a t rademark of Ne tgear , Inc. Microsoft, W indows, and W indow s NT are registered trademar ks 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 i[...]

iii Bestätigung des Herstellers/Imp orteurs Es wird hiermit bestätigt, daß da s CG814M W ireless Cable M odem Gateway gemä ß der im BMP T -AmtsblVf g 243/1991 und Vfg 46/1992 aufgeführten B estimmungen entstört ist. Das vorschriftsmäßige Betrei ben einiger Geräte (z.B. T estsender) kann jedoch gewissen Beschränkungen unterlie gen. Lesen [...]

iv[...]

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

vi Contents Connecting the CG814M Gateway ..... ................ ................ ............. ................ ............... 2-5 Connecting to Y our Computer ............ ................ ................. ............. ................ ........ 2-5 Ethernet ....... ................ ............. ................ ............. ............. ...[...]

Contents vii Viewing Gateway S tatus .................... ................ ............. ................. ............ ............ 5-2 Connection S tatus .............. ............. ................ ............. ................ ............. ............... 5-4 Current System T ime ...... ................. ......... ....... ............. .....[...]

viii Contents Single IP Address Operation Using NA T ......... ................ ................. ................ ....... B-8 MAC Addresses and Address Re solution Protocol ...... ................ ............. .............. B-9 Related Documents ...... ............. ................ ................ ............. ................ ...............[...]

Contents ix What Is Y our Configuration Information? .. ... ................ ............. ............. ................ . C-9 Obtaining ISP Configuration Information for Windows Computers ........ ......... C-10 Obtaining ISP Configuration Information for Macintosh Computers ... ............ C-1 1 Restarting the Network ............. ............[...]

x Contents[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway About This Manual xi About This Manual Thank your for purcha sing the NETGEAR ™ CG814M W ireless Cable Modem Gateway. This manual describes the features of the gatewa y and provides installation and configuration instructions. Audience This reference manual a ssumes that the read[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y xii About This Manu al S pecial Message Format s This guide uses the following format s to highlight special messages: T echnical Support For help with any t echnical issues, co ntact Customer Support at 1-888-NETGEAR, o r visit us on the W eb at www .NETGEAR.com. The NETGEAR W e [...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Introduction 1-1 Chapter 1 Introduction This chapter describes the features of the N ETGEAR CG814M W ireless Cable Modem Gateway. About the CG814M Gateway The NETGEAR CG814M W ireless Cable Modem Gateway connects directly to the wide area network (W AN) using its built-in cab le mo[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 1-2 Introduction A Powerful, T rue Firewall Unlike simple Internet sharing NA T routers, the CG 814M Gateway is a true firewall, using stateful packet inspection to defend against ha cker attacks. Its firewall features include: • Denial of Service (DoS) protection Automatically [...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Introduction 1-3 Configurable Auto Upli nk™ Ethernet Connection W ith 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 W AN interfaces are autos[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 1-4 Introduction Easy Inst allation and Management Y ou can install, configure , and operate the CG81 4M Gateway within minutes after connecting it to the network. The following features simp lify installation and management tasks: • Browser-based management Browser-based config[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Introduction 1-5 What’ s in the Box? The product package should co ntain the following items: • CG814M 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 — Application [...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 1-6 Introduction Y ou can use some of the LED s to verify connectio ns. Ta b l e 1- 1 lists and describes each LED on the front panel of the CG814M Gate way. These LEDs are green when lit. Ta b l e 1- 1. LED Descriptions Label Activity Description Power On Off Power is supplied to[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Introduction 1-7 The Gateway’ s Rear Panel The rear panel of the CG814M Gateway ( Figure 1-2 ) con tains the connec tions identified below . Figure 1-2: CG814M Gateway Rear Panel V iewed from left to right, the rear panel contains the following elements: • AC power adapter inpu[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 1-8 Introduction[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Connecting th e Gatewa y to the Internet 2-1 Chapter 2 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 Y ou Will Need Before Y ou Begin Y o[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 2-2 Connecting the Gateway to the Internet LAN Configuration Requirement s For the initial connection to the In ternet and configuration of your gateway, you will need to connect a computer to the gateway which is set to automatically get its TC P/IP configuration from the gateway[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Connecting th e Gatewa y to the Internet 2-3 • Y ou may also refer to the CG81 4W Resour ce CD for the NETGEAR Router ISP Guide which provides Internet connection infromation for many ISPs. Once you locate your Internet conf iguration parameters, you may want to record them on th[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 2-4 Connecting the Gateway to the Internet Record Y our Internet Co nnection Information 1. Print this page. Fill in the configuration parameters from your Internet Service Provider (ISP). Fixed or S tatic IP Address: If you have a static IP address, re cord the following informat[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Connecting th e Gatewa y to the Internet 2-5 Connecting the CG814M Gateway Before using your mode m, you need to do the following: • Connect to your computer , using either Ethernet, USB or wireless (see page 2-6 ). • Connect the line from your cable service provid er to the ca[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 2-6 Connecting the Gateway to the Internet Ethernet T o connect your computer to the modem via Ethernet: 1. Locate the Category 5 Ethernet ca ble which came with your modem. 2. Connect your computer to the modem using the Ethernet cable.: USB T o connect your computer to the modem[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Connecting th e Gatewa y to the Internet 2-7 The found new hardware W indows installatio n wizard will prompt you for the drivers. Browse to the CD and install the USB driver by clicking through th e W indows wiza rd prompts. Wire le ss Detailed instructions on config uring your w [...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 2-8 Connecting the Gateway to the Internet Connecting the Power Adapter T o connect the power adapter to the gateway: 1. Plug the connector of the po wer adapter into outlet on th e rear panel of the modem. 2. Plug the other end of the adapter into an AC power outlet. 3. V erify t[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Connecting th e Gatewa y to the Internet 2-9 Now that the gateway, and the computer are turned on, verify the following: • When power on the ga teway was first turned on, th e PWR light went on, the numbere d LAN LEDs turned on for a few seconds. • The gateway’ s LOCAL LINK/A[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 2-10 Connectin g the Ga teway to the Internet For security reasons, the gateway has its own u ser name and password. When prompted, enter admin for the gateway User Name and pa s s w o r d for the gate way Password, both in lower case letters.. 4. Connect to the Internet Figure 2-[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Connecting th e Gatewa y to the Internet 2-11 Connecting the CG814M Gateway to the Internet The gateway is now properly attached to your ne twork. Y ou are ready to configure your gateway to connect to the Internet. T o co ntinue installation, click on the Basic Settings menu, show[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 2-12 Connectin g the Ga teway to the Internet If you have set your configuration for Dynamic IP , below , then an IP address shown here is an indication that you have successfully re ceive d an IP address from your service provider . If you have set your configuration to S tatic I[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Connecting th e Gatewa y to the Internet 2-13 5. Firewall Protection: Normally firewall protection shou ld be enabled to protect your network from attacks from the internet. Removing the check from the “Firew all Protection” box disable s your firewall. 6. Click Apply to save y[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 2-14 Connectin g the Ga teway to the Internet[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Wireless Configuration 3-1 Chapter 3 Wireless Configuration This chapter describes how to configure the wire less features of your CG814M W irele ss Cable Modem Gateway. Considerations For A Wireless Network In planning your wire less network, you sh ould consider the lev el of sec[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 3-2 Wireless Configuration Placement and Range The operating distance or ran ge of your wireless connection ca n vary significantly based on the physical placement of the wi reless gateway. For be st results, place your gateway: • near the center of the area in which your PCs wi[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Wireless Configuration 3-3 Wireless Settings In the W ireless Settings section are the following parameters: • Name (SSID) Enter a Service Set ID (SSID) value of up to 32 alphanumeric characters. The same SSID mus t be assigned to all wireless device s in your network . The defau[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 3-4 Wireless Configuration The W ireless Access window displays a list of MA C addresses that will be allowed to connect to the gateway. These PCs must also have the co rrect SSID and WEP settings . T o restrict access based on MAC a ddresses: 1. Click the Add button to go to the [...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Wireless Configuration 3-5 • Automatic - Enter a word or gro up of printabl e characters in the Passphrase box and click the Generate button. The four key boxes will be automat ically populated with key values. • Manual - Enter ten hexadecimal digits (a ny combination of 0 -9, [...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 3-6 Wireless Configuration[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Protecting Your Network 4-1 Chapter 4 Protecting Y our Network This chapter describes how to use the firewall features of the CG814M W ireless Cable Modem Gateway to protect your network . Protecting Access to Y our CG814M Gateway For security reasons, the gateway has its own user [...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 4-2 P rotecting Your Network 2. From the Main Menu of the browser interface, under the Maintenanc e heading, select Set Password to bring up the menu shown in Figure 4-2 . Figure 4-2: Set Password menu 3. T o change the password, first enter the old p assword, and then enter the n[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Protecting Your Network 4-3 • Allowing access to only web site s that you specify as allowed. • Filtering of Pr oxy servers, Cooki es, Java, ActiveX and Popup W indows The section below expl ains how to configure your gateway to perform these functions. Block Keywords and Domai[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 4-4 P rotecting Your Network 1. Click on the Block Sites link of the Content Filtering menu. Figure 4-3: Block Sites menu 2. T o enable keyword blocking or Domain Blocking, check the appropriate Enable box.[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Protecting Your Network 4-5 3. Enter Keywords into the Keyword List b y t yping 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 blocke[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 4-6 P rotecting Your Network Most web surfing is done on port 80. The parental c ontrol feature monitors port 80 so proxy based web surfing would not be insp ected by the parental controls. The proxy filter sh ould be used if parental contro ls are being used. Cookies A cookie is [...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Protecting Your Network 4-7 rule you have defined. T o configure outbound rules on the CG814M Gat eway, click the Port Blocking link on the Advanced section of the main menu. Figure 4-4: Port Blocking menu • T o bloc k outbound traffic, select the service you wo uld like to block[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 4-8 P rotecting Your Network only one IP address to the Inte rnet, and outside users cannot dire ctly 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 Inter[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Protecting Your Network 4-9 1. Select the service you would like to forw ard from the drop-down list of predefined services. If the service you would like to forward is no t in the predefined list, you can add a custom service. Enter the range of ports yo u would like to forward an[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 4-10 Protecting Your Networ k changed. Port T riggering monitors outbound traf fic. When the gateway detects traffic on the specified outbound port, it remembers the IP address of the computer that sent the da ta and “triggers” the incoming port. Incoming traffic on the trigge[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Protecting Your Network 4 -11 1. In the T rigger Range, enter the outb ound ports that will be monito red for activity . This will be the “trigger”. 2. In the T arge Range, enter the in bound ports that should be forw arded when the trigger occurs. 3. Select the appropriate pro[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 4-12 Protecting Your Networ k W AN Port’ check box. This sh ould only be used as a diagnostic tool, since it allows your gateway to be discovered. Don't che ck this box unless you have a specific reason to do so.[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Managing Your Network 5-1 Chapter 5 Managing Y our Network This chapter describes how to perform network ma nagement tasks with yo ur CG814M W ireless Cable Modem Gateway. Network S t atus Information The CG814M p rovides a variety o f status and usage information which is discusse[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 5-2 Mana ging Your Ne twork V iewing Gateway S t atus From the Main Menu, under Main tenance, sel ect Gateway S tatus to view the screen in Figure 5-1 . Figure 5-1: Gateway St atus screen This screen shows the following parameters: Ta b l e 5-1. Menu 3.2 - Router S t atus Fields F[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Managing Your Network 5-3 CM Certificate If the Cable Modem certificate is Instal led, it is possible for the service provider to upgrade your Data Over Cable service securely . S tatus System Up T ime This is the time since the gateway has registered with your cable service provid[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 5-4 Mana ging Your Ne twork Connection St atus From the Main Menu, under Main tenance, se lect Connection to vi ew the screen in Figure 5-2 . Figure 5-2: Connection screen This screen shows detailed inform ation about the status of the connection to your cable service provider tha[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Managing Your Network 5-5 Current System Tim e The date and time is acquired from your cable se rvice 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 [...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 5-6 Mana ging Your Ne twork DHCP By default, the gateway will function as a DHCP (D ynamic 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 [...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Managing Your Network 5-7 V iewing and Emailing Logged Information The gateway will log security-relate d events such as denied inco ming service requests, hacker probes, and administrato r logins. If you en abled content filtering, the Logs page shows you when someone on your netw[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 5-8 Mana ging Your Ne twork Enabling Logs Event E-mail Notification In order to receive logs and alerts by e-mail, you mu st provide you r 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 b[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Managing Your Network 5-9 Running Diagnostic Utilities The CG814M Gate way has a d iagnostics feature . Y ou can us e the diagnostics menu to test connectivity to PC us ing the Ping command: From the Main Menu of the brows er interface, under the Maintena nce heading, select the Di[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 5-10 Managi ng Your Netw ork[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Troubleshooting 6- 1 Chapter 6 T roubleshooting This chapter gives information about troubleshooting your CG814M 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 “B[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 6-2 Troubleshooting e. 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 of f wh en your gateway is turned on : • Make sure that the power cord is properly c[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Troubleshooting 6- 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 se cure at the gateway and at the wall jack. • Make sure that your cable int[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 6-4 Troubleshooting • Make sure you are usin g the correct log in info rmation. The factory de fault login name is admin and the password is password . Make sure that CAPS LOCK is of f when entering this information. If the gateway does not save cha nges you have ma de in the W [...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Troubleshooting 6- 5 ping 192.168.0.1 3. Click on OK. Y ou 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 >: b ytes=32 time=NN ms TTL=xxx If the path is not working, yo[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 6-6 Troubleshooting — 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. V erify that the IP address of the gat[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Technical Specifications A-1 Appendix A T echnical S pecifications This appendix provides tech nical specifications for the CG814M W ireless Cable Modem Gateway. Network Protocol and St andards Comp ati bility Data and Routing Protocol s: TCP/IP DHCP server and client DNS relay NA [...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y A-2 Technical S pecifications Local: 10BASE-T or 100BASE-Tx, RJ-45 USB 1.1 Function 802.1 1b W ireless Access Point Internet: DOCSIS 1.0, upgradeable to DOCSIS 1.1[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics B-1 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 dire cted to variou s RFC documents for further informat[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y B-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 [...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics B-3 The latter version is easier to remember and easie r to enter into your computer . In addition, the 32 bits of the ad dress are subdivided into two part s. The first part of the address identifies the network, and the seco nd part identifi[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y B-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[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics B-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 addres s, following a backward slash (/), as “/n.” In the example, [...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y B-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 [...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics B-7 NETGEAR strongly recommends that y ou 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 u[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y B-8 Networks, Routing, and Firewall Basics Single IP Address Operation Using NA T 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 singl[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics B-9 This scheme of fers the additional benefit of fi rewall-like protection because the internal LAN addresses are not available to the Internet thro ugh the translated connection. All inc oming inquiries are filtered out by th e router . This[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y B-10 Networks, Routing, and Firewall Ba sics Domain Name Server Many of the resources on the In ternet can be addressed by si mple descriptive names such as www .NETGEAR.com . This addressing is very helpful at th e application level , but the descriptive name must be transl ated [...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics B-11 What is a Firewall? A firewall is a device that protects one netw ork from another , while allowing communicat ion between the two. A firewall incorporates the functi ons of the NA T router , while adding features for dealing with a hacke[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y B-12 Networks, Routing, and Firewall Ba sics Wireless Networking The CG814M Gateway conforms to the Institute of Electrical and Electronics Engineers (IEEE) 802.1 1b standard for wireless L ANs (WLANs). On an 802.1 1b wireless link, data is encod ed using direct-sequence spre ad-s[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics B-13 In the infrastructure mode, the wireless access poin t converts airwave data into wired Ethe rnet data, acting as a bridge between the wired LAN and wireless clients. Co nnecting multiple Access Points via a wired Ethernet back bone can f[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y B-14 Networks, Routing, and Firewall Ba sics The 128-bit WEP data encryption method consists of 104 user -conf igurable bits. S imilar to the forty-bit WEP data encryption me thod, the remaining 24 bits are factory set and not user configurable. Some vendors allow passphrases to b[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Networks, Routing, and Firewall Basics B-15 Note: The a vailable ch annels sup ported by the wireless products in various countries are different. The preferred channel separation betw een the chan nels in neighboring wireless network s is 25 MHz (5 channels). This means that you c[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y B-16 Networks, Routing, and Firewall Ba sics are exchanged at one of the two cable connector s. Crossover cables are often unmarked as such, and must be identified by comp aring the two connectors. Since the cable connectors are clear plastic, it is easy to place them side by side[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Preparing Your Ne twork C-1 Appendix C Prep aring Y our Network This appendix describes how to prep are your ne twork to connect to the Internet through the CG814M W ireless Cable Modem Gateway and how to verify the readiness of bro adband Internet service from an Internet service [...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y C-2 P reparing Yo ur Network • All versions of UNIX o r Linux include TCP/IP components. Follow the instructions provided with your operating system or networking so ftware to install TCP/IP on your computer . In your IP network, each PC and the gateway must be assigned a unique[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Preparing Your Ne twork C-3 Y ou must have an Ethernet adapter , the TCP/IP protocol, and Client for Microsoft 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 model[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y C-4 P reparing Yo ur Network If you need Clie nt for Microsoft 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 DH[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Preparing Your Ne twork C-5 5. Uncheck all boxes in the LAN Internet Configuration screen and cl ick Next. 6. Proceed to the end of the W izard. V e rifying TCP/IP Properties After your PC is configured and has rebooted, you can check the TCP/IP configuration using the utility wini[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y C-6 P reparing Yo ur Network 5. V erify that ‘Client for Microsoft Networks’ and ‘Internet Protocol (TCP/IP)’ are present. If not, select Install and add them. 6. Select ‘Internet Protocol (TCP/IP)’, click Prop erties, and verify that “Obtain an IP address automatica[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Preparing Your Ne twork C-7 The TCP/IP Control Panel opens: 2. From the “Connect via” box, select your Macintosh’ s Ethernet interface. 3. From the “Configure” box, select Using DHCP Server . Y ou can le ave the DHCP Client ID box empty . 4. Close the TCP/IP Control Panel[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y C-8 P reparing Yo ur Network V erifying TCP/IP Properties for Macintosh Computers After your Macintosh is confi gured and has rebo oted, you can check the TC P/IP configuration by returning to the TCP/IP Control Panel. From th e Apple menu, select Control Panels, then TCP/IP . The[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Preparing Your Ne twork C-9 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. For a single-user Internet account, your [...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y C-10 Prep aring 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 names may look lik[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Preparing Your Ne twork C-1 1 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 Re move to remove the gateway address. 6. Select the DNS Configuration tab. If any DNS server addresses [...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y C-12 Prep aring Your Network Rest arting 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 communicat e correctly . Restart a ny computer that is connected to the firewall. After configuring all of yo[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Glossary 1 Glossary 10BASE-T IEEE 802.3 specification for 10 Mbps Ethernet over twisted pair wiring. 100BASE-Tx IEEE 802.3 specification for 100 Mbps Et hernet over twisted pair wiring. 802.1 1 b IEEE specification for wireless networking at 1 1 Mbps using direct-sequence spread-sp[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 2 Glossary Gateway A local device, usually a router , that c onnects hosts on a local netwo rk to other networks. IETF Internet Engin eering T ask Force. An open international communi ty of network designers, operators, ven dors, and researchers concerned with the evolution of the[...]

Reference Manual for th e Model CG814M Wireless Cable Modem Gateway Glossary 3 NA T See Netw ork Address T ranslation. netmask A num ber that explains whi ch part of an IP address co mprises 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 addres[...]

Reference Manual for the Model CG814 M Wireless Cable Modem Gatewa y 4 Glossary VPN V irtual Private Network. A method for securely transport ing data between two private networks by using a public ne twork such as the Internet as a connection. WA N See wide area network. WEP W i red Equivalent Privacy . WEP is a da ta encryption protocol for 802 .[...]