NETGEAR ME103 manual Internet Security and Firewalls, MAC Addresses and ARP

Page 92

Reference Manual for the ME103 802.11b ProSafe Wireless Access Point

MAC Addresses and ARP

An IP address alone cannot be used to deliver data from one LAN device to another. To send data between LAN devices, you must convert the IP address of the destination device to its media access control address (MAC address). Each device on an Ethernet network has a unique MAC address, which is a 48-bit number assigned to each device by the manufacturer. The technique that associates the IP address with a MAC address is known as address resolution. Internet Protocol uses the ARP to resolve MAC addresses.

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 request. The destination IP address for the chosen station is included as part of the message so that only the station with this IP address responds to the ARP request. All other stations discard the request.

The station with the correct IP address responds with its own MAC address directly to the sending device. The receiving station provides the transmitting station with the required destination MAC address. The IP address data and MAC address data for each station are held in an ARP table. The next time data is sent, the address can be obtained from the address information in the table.

For more information about address assignment, refer to the IETF documents RFC 1597, Address Allocation for Private Internets, and RFC 1466, Guidelines for Management of IP Address Space.

Internet Security and Firewalls

When your LAN connects to the Internet through a router, an opportunity is created for outsiders to access or disrupt your network. A NAT router provides some protection because by the very nature of the process, the network behind the router is shielded from access by outsiders on the Internet. However, there are methods by which a determined hacker can possibly obtain information about your network or at the least can disrupt your Internet access. A greater degree of protection is provided by a firewall router.

C-10

Network, Routing, Firewall, and Cabling Basics

August 2003

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Contents August Technical Support RF Exposure Requirements EN 55 022 Declaration of Conformance Radio Frequency Interference RequirementsRegulatory Compliance Information 0470 August Contents Chapter Maintenance Appendix a Specifications Glossary Index Manual Specifications Chapter About This ManualAudience ScopeTypographical Conventions Special Message FormatsHow to Use the Html Version of this Manual Html version of this manualHow to Print this Manual About the ME103 802.11b ProSafe Wireless Access Point Chapter IntroductionKey Features Supported Standards and Conventions802.11b Standards-based Wireless Networking Compatible and Related Netgear Products System RequirementsAutosensing Ethernet Connections with Auto Uplink What’s In the Box? Hardware DescriptionME103 Wireless Access Point Front Panel ME103 front panelME103 Wireless Access Point Rear Panel ME103 rear panelChapter Basic Installation and Configuration Observing Placement and Range GuidelinesCabling Requirements Default Factory Settings Feature Factory Default SettingsUnderstanding ME103 Wireless Security Options Installing the ME103 802.11b ProSafe Wireless Access Point SET UP the ME103 Access PointConfigure LAN and Wireless Access Verify Wireless Connectivity How to Log In to the ME103 Using Its Default NetBIOS Name Example ME103 NetBIOS name in browser address barWeb browser will then display the ME103 home How to Log In to the ME103 Using Its Default IP Address Understanding Basic Wireless Settings Basic Wireless Settings menuUnderstanding Basic Wireless Security Options Basic Wireless Security optionsField Description Network Authentication. Circle one Open System or Shared Key How to Set Up and Test Basic Wireless Connectivity How to Restrict Wireless Access by MAC Address 10 Wireless Card Access List SetupHow to Configure WEP Using the Basic IP Settings Options 11 Basic IP Settings MenuAccess Point Name NetBIOS Chapter Maintenance Viewing General, Log, Station, and Statistical InformationField Description Access Point Information General Information FieldsStatistics Statistics Fields Field Description System Up TimeActivity Log Activity Log screenViewing a List of Attached Devices Information Station List of associated devicesUpgrading the Wireless Access Point Software ME103 Upgrade menuConfiguration File Management Settings Backup menuUsing the Reset Button to Restore Factory Default Settings Saving and Retrieving the ConfigurationRestoring the ME103 to the Factory Default Settings Changing the Administrator Password Set Password menuBasic Requirements for Chapter Advanced ConfigurationConfiguring Advanced Security 802.1x Options How to Configure the 802.1x Key Exchange Option Key Exchange Configuration WorksheetAdvanced Configuration Request a certificate View the ME103 log and check the connection Running a Ping test from Windows Ping test results Understanding Advanced Wireless Settings Advanced Wireless Settings screenAdvanced Wireless Settings Fields Field Description Operating ModeConfiguring Wireless Operating Modes How to Configure a ME103 as a Point-to-Point BridgeHow to Configure Multi 10 Multi-Point bridgingAdvanced Configuration Antenna Installation Blank Configuration Worksheet EAP-TLS Configuration WorksheetChapter Troubleshooting No lights are lit on the access pointWireless LAN activity light does not light up LAN light is not litWhen I enter a URL or IP address I get a timeout error Am using EAP-TLS security but get disconnectedCannot connect to the ME103 to configure it Using the Reset Button to Restore Factory Default Settings Appendix a Specifications Specifications for the ME103Specifications Infrastructure Mode Appendix B Wireless Networking BasicsWireless Networking Overview Network Name Extended Service Set Identification Essid Authentication, WEP, and WPAAd Hoc Mode Peer-to-Peer Workgroup Authentication Open System Authentication802.11b Authentication Open System Steps 802.11b Authentication Shared Key Steps Key Size Wireless Channels WEP Configuration OptionsRadio frequency channels used are listed in Table B-1 Table B-1 802.11b Radio Frequency ChannelsUnderstanding 802.1x Port Based Network Access Control Wireless Networking Basics Wireless Networking Basics Wireless Networking Basics Appendix C Network, Routing, Firewall, and Cabling Basics Basic Router ConceptsWhat is a Router? IP Addresses and the InternetClass E Class E addresses are for experimental use Netmask Subnet AddressingExample of Subnetting a Class B Address Netmask Notation Translation Table for One Octet Netmask FormatsSingle IP Address Operation Using NAT Private IP AddressesIP Configuration by Dhcp Single IP Address Operation Using NATDomain Name Server Routing ProtocolsInternet Security and Firewalls MAC Addresses and ARPStateful Packet Inspection What is a Firewall?Denial of Service Attack Ethernet Cabling Uplink Switches, Crossover Cables, and MDI/MDIX SwitchingUTP Ethernet cable wiring, straight-through Cable Quality Network, Routing, Firewall, and Cabling Basics Appendix D Preparing Your PCs for Network Access Configuring Windows 98 and Me for TCP/IP NetworkingInstall or Verify Windows Networking Components Preparing Your Computers for TCP/IP NetworkingPreparing Your PCs for Network Access Enabling Dhcp to Automatically Configure TCP/IP Settings Choose Settings, and then Control PanelPrimary Network Logon is set to Windows logon Selecting Windows’ Internet Access Method Verifying TCP/IP PropertiesConfiguring Windows 2000 or XP for TCP/IP Networking Dhcp Configuration of TCP/IP in Windows XP TCP/IP details are presented on Support tab Dhcp Configuration of TCP/IP in Windows Right click on Local Area Connection and select PropertiesObtain an IP address automatically is selected Verifying TCP/IP Properties for Windows XP or Preparing Your PCs for Network Access Glossary DMZ DSL Internet service provider Radius TLS Wins Glossary Index NumericsRFC
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ME103 specifications

The NETGEAR ME103 is a versatile and reliable Wireless Access Point designed to extend the reach of your network while providing enhanced connectivity for various devices. Ideal for both home and small office environments, the ME103 is an essential component for those seeking to improve wireless performance without compromising on speed or stability.

One of the main features of the NETGEAR ME103 is its compatibility with numerous wireless standards. It supports the 802.11b and 802.11g protocols, allowing users to connect a wide range of wireless devices, including laptops, smartphones, and tablets. This compatibility ensures that the ME103 can seamlessly integrate into existing networks, making it a flexible solution for upgrading Wi-Fi coverage.

The ME103 is equipped with fast data transfer rates, reaching up to 54 Mbps in 802.11g mode. This speed is sufficient for most online activities, including streaming videos and online gaming, providing users with a smooth and uninterrupted experience. Its ability to function as both an access point and a bridge allows for increased versatility, enabling connectivity between wired and wireless devices.

In terms of security, the NETGEAR ME103 has built-in features that protect your network from unauthorized access. It supports Wired Equivalent Privacy (WEP) and Wi-Fi Protected Access (WPA) encryption protocols, ensuring that data transmitted over the network remains secure. Additionally, it includes a built-in firewall that further safeguards against potential threats.

The device is also equipped with an easy-to-use web interface for configuration, making it simple for users to set up and manage their network settings. Its compact design allows for flexible placement options, whether mounted on a wall or placed on a desk. This adaptability is crucial for optimizing wireless coverage in larger spaces.

Power over Ethernet (PoE) support is another significant characteristic of the ME103, which simplifies installation by allowing the device to receive power through the Ethernet cable, eliminating the need for an additional power source.

Overall, the NETGEAR ME103 stands out due to its high compatibility, solid performance, and ease of use, making it an excellent choice for users looking to enhance their wireless connectivity efficiently.
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