Building A Wireless Office

Introduction to Wireless LANs Wireless Networking Devices Wireless LAN Network Adapters Access Point Types of Networking Wireless Bridge Wireless Routers Wireless Access Server Rationale for Wireless LANs Economics Adds, Moves, and Changes Roaming Disadvantages to Wireless LANs Learning New Technology Proliferation of Standards Security Applications Home Use Hospital College Campus Office Support Portals Book Preview Technology and Terminology IEEE Standards Basic Wireless LAN Operations The TCP/IP Protocol Suite Security Working with Vendor Products The Future Technology and Terminology Basic Communications Concepts Frequency Wavelength Bandwidth Modulation Methods Amplitude Modulation Frequency Modulation Phase Modulation Nyquist Relationship Quadrature Amplitude Modulation Differential Modulation Signaling Methods Infrared Types of Infrared Transmission Limitations Frequency Hopping Spread Spectrum Rationale for Spread Spectrum Operation Direct Sequence Spread Spectrum Operation Orthogonal Frequency Division Multiplexing Evolution Operation The Frequency Spectrum and Wireless LANs ISM Bands Where Wireless LANs Reside Measurements Power Ratios Bel Decibel Decibel Milliwatt Signal-to-Noise Ratio Channel Capacity Antenna Considerations Radiation Pattern Beamwidth Antenna Gain Wireless LAN Terminology Architecture The Station Network Topologies Ad Hoc Networking Infrastructure Networking Access Point Operation The Distribution System The Extended Service Set Media Access Control CSMA/CA The Hidden Node Problem IEEE Standards Basic Architecture Layer Separation Physical Layer Operation Infrared Frequency Hopping Spread Spectrum Modulation Frequency Channels Direct Sequence Spread Spectrum Barker Code Modulation Comparison to FHSS Complementary Code Keying Code Sets Orthogonal Frequency Division Multiplexing Frequency Allocation Scope of Coverage Physical Layer Operations FHSS DSSS OFDM MAC Layer Operations Layer 2: Framing Protocol Version Field Type and Subtype Fields ToDS/FromDS Fields More Frag Field Retry Field Power Management Field More Data Field WEP Field Order Field Duration/ID Field Address Fields Sequence Control Field Frame Body Field CRC Field Management Frames The Beacon Frame The Probe Response Frame Control Frames Hidden Nodes Use of RTS and CTS Frames RTS and CTS Frame Formats ACK Frame Media Access Time Gaps DCF Operation PCF Operation Basic Wireless LAN Operations Ad Hoc Networking Adapter Card Setup Configuring a Wireless Network Adapter Ad Hoc Settings TxRate WEP PS Mode Channel Network Software Enabling File and Print Sharing Assigning Identifiers Sharing Network Resources Setting TCP/IP Parameters The Proof Is in the Pudding Internet Connection Sharing Installation Configuration Infrastructure Operations Wireless Router Configuration Access the Router Configuring a PC IP Address Configuring the DNS Gateway Configuration Using Your Browser Accessing the Configuration Setup Utility Using the Setup Wizard System Name Assignment Wireless LAN Setup Parameters Defining the Wired Connection Defining Address Assignments Internet Access via the Router Site Selection TCP/IP Protocol Suite The Internet Protocol Datagrams and Segments Datagrams and Datagram Transmission Routing The IP Header Vers Field Hlen Field Service Type Field Total Length Field Identification and Fragment Offset Fields Flags Field Time to Live Field Protocol Field Header Checksum Field Source and Destination Address Fields IP Addressing The IP Addressing Scheme Address Classes Rationale Class Addressing Overview Class A Address Class B Addresses Class C Addresses Class D Addresses Class E Addresses Dotted Decimal Notation Basic Workstation Configuration Reserved Addresses Subnetting Overview Subnetting Example Host Restrictions The Zero Subnet Internal Versus External Subnet Viewing Using the Subnet Mask Multiple Interface Addresses Address Resolution Ethernet and Token Ring Frame Formats LAN Delivery Address Resolution Operation ARP Packet Fields Locating the Required Address Gratuitous ARP Proxy ARP RARP ICMP Overview The ICMP Type Field The ICMP Code Field Evolution The Transport Layer TCP Overview The TCP Header Source and Destination Port Fields Multiplexing and Demultiplexing Port Numbers Well-Known Ports Registered Ports Dynamic or Private Ports Sequence and Acknowledgment Number Fields Hlen Field Code Bits Field Window Field Checksum Field Urgent Pointer Field Options Field Padding Field Connection Establishment Connection Function Calls Port Hiding Passive OPEN Active OPEN The Three-Way Handshake Overview Operation The TCP Window Avoiding Congestion TCP Slow Start The Slow-Start Threshold TCP Retransmissions Session Termination UDP The UDP Header Source and Destination Port Fields Length Field Checksum Field Operation Applications The DNS The Domain Name Structure The Domain Name Tree The Name Resolution Process Data Flow Time Consideration DNS Records Checking Records Diagnostic Tools Ping Operation Implementation Using Windows NT Ping Traceroute Operation Using Windows Tracert Tracing a Route Applications NSLOOKUP Operation Viewing the SOA Record Protecting Server Information Finger Format Security Considerations Applications Security Security Risks Architecture The Role of the SSID Insertion Attacks Monitoring Attacks Masquerade Broadcast Monitoring Denial of Service Attacks Other Attack Methods Exploiting File Sharing SNMP Community Names Accessing a Management Console Encryption Attacks Theft of Hardware Understanding WEP Overview Setup Example Cipher Operation RC4 Algorithm Operation WEP Key Definition Authentication Methods Open Authentication Shared Key MAC Address 201 Vulnerabilities The IV Attack Methods Using the IV Enhancing Wireless Security MAC Address-Based Authentication Use Dynamic WEP Keys LEAP Authentication Using Secure Sockets The VPN Solution Bar Code Authentication The IEEE 802.1x Standard Overview Cisco Implementation Orinoco Implementation Router Access Control Shielding Working with Vendor Products Agere System's Orinoco Wireless Kit Client Setup Installation Software Client Manager Adjusting the Configuration Network Name Security Setting Power Management TCP/IP Behavior Setting Up the Residential Gateway The Welcome Screen RG Identification Specifying the Internet Connection Settings Summary Network Topology Advanced Features Card Testing Link Test Cisco Aironet Aironet Client Utility Configuring the Client System Parameters Tab RF Network Tab Home Networking Tab Network Security Tab Advanced Settings Interesting Product Features Netgear MR324 Wireless Router System Settings System Name Password DDNS LAN Setup RIP Support Wireless LAN Setup Port Forwarding Static Route Content Filter Other Features SMC Networks Barricade Wireless Router Router Access Access Control Virtual Server DMZ Host Remote Administration Host Administrative Timeout Discard Ping Nonstandard FTP Port Interoperability WEP Key Considerations The Future Evolving Wireless LAN Products Print Servers Rationale Types of Servers Authentication Server RADIUS Token Card Evolving Wireless LAN Standards The 802.1x Standard The 802.11g Standard