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1 Networking Systems Design and Development Lee Chao CRC Press Taylor & Francis Croup Boca Raton London New York CRC Press is an imprint of the Taylor & Francis Croup, an Informa business AN AUERBACH BOOK

2 Contents Preface Motivation Objectives of the Book Features of the Book Organization of the Book Acknowledgments The Author xi xi xi xii xii xvii xix 1 Linux Networking Overview Introduction Overview of Linux Operating Systems Brief History Linux Distributions Linux Networking Linux Network Architecture Linux Networking Tasks and Network Tools Book Framework Summary 29 2 Network Protocols Introduction Application Layer Protocols Transport Layer Protocols Transmission Control Protocol (TCP) User Datagram Protocol (UDP) Internet Layer Protocols Internet Protocol (IP) Internet Control Message Protocol (ICMP) Address Resolution Protocol (ARP) IP Security (IPSec) Internet Routing Protocols Network Interface Layer Protocols Network Protocol Graph Summary 64 v

3 vi Contents 3 Network Technologies Introduction Network Types Local Area Network Ethernet Fibre Channel Wide Area Network Internet Wireless Network Network Media Modulation Multiplexing Twisted-Pair Wire Optical Fiber Wireless Transmission Media Network Devices Network Interface Cards Network Switches Network Routing Equipment Summary Network Design Introduction Network Design Requirement Investigation Logical Network Model IP Addressing and Routing Strategy Security Policy Planning for Physical Implementation IP Addressing IPv4 IP Addressing Special IP Addresses Private and Public IP Addressing IPv6 Addressing Unicast IP Address Multicast Anycast Subnets Reasons for Using Subnets Subnet Masks Network Subnetting Classless Inter-Domain Routing (CIDR) Summary Network Services Introduction User Accounts Users and Groups 140

4 Contents vii 5.3 Dynamic Host Configuration Protocol (DHCP) Dynamic IP Address Assignment Process DHCP Configuration Name Services Naming Hierarchy DNS Server Hierarchy Name Resolution Process DNS Zones Types of DNS Records Summary Routing Introduction Connecting Networks with Routers Routing Table Updating Routing Table Route Calculation Link State Routing Algorithm Distance Vector Routing Algorithm Routing across Networks Summary Linux Network Resource Sharing Introduction Network File System (NFS) NSF Technology Overview NFS Configuration Sharing Network with Windows Samba Features and Applications Configuration ofsamba Services Remote Access through VPN VPN Technology Internet Protocol Security (IPSec) Secure Sockets Layer (SSL) VPN Point-to-Point Tunneling Protocol (PPTP) VPN Configuration Network Address Translation (NAT) NAT Technology NAT Application and Configuration Summary Internet Services 8.1 Introduction Web Services Hypertext Transfer Protocol (HTTP) WebServers Web Server Configuration 252

5 viii Contents 8.3 File Transfer Service FTP Server and Client FTP Connection FTP Commands FTP Configuration Service System Transfer Service Configuration Summary Network Security Introduction Security Issues Network Security Policies Intrusion into Computer Systems Intrusion into Networks Computer Viruses Network Security Measures Security Technologies Intrusion Detection System (IDS) IP Security (IPSec) Remote Authentication Dial In User Service (RADIUS) Secure Shell (SSH) Secure Sockets Layer (SSL) Wi-Fi Protected Access Network Firewalls Firewall Rules Firewall Types Firewall Architectures Summary Network Resource Management Introduction User Account Management User Management Group Management Directory Service Management Network Device Resource Management Viewing Device Information Device Management Daemons Hardware Abstraction Layer (HAL) User Device (udev) Kernel Management Summary 357

6 Contents ix 11 Wireless Networks Introduction Wireless Network Technologies Wi-Fi Technology WiMAX Technology Infrared Bluetooth Wireless Network Devices Linux-Compatible Wireless Network Devices Linux Compatibility Wireless Device Chipsets Wireless Device Drivers NDISwrapper Wireless Network Configuration Tools Viewing Wireless Network Device Information Configuration of Wireless Network Devices Summary Mobile Networks Introduction Mobile Linux Mobile Devices Mobile Network Mobile Network System First-Generation Mobile Network Second-Generation Mobile Network Third-Generation Mobile Network Universal Mobile Telephone Service (UMTS) CDMA Mobile Network beyond Third Generation Summary 423 Index 429

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