Linux Networking

• 1 Introduction
• 2 The OSI Networking Model
  • 2.1 Table 2-1: The Seven OSI Layers
• 3 An Introduction to TCP/IP
  • 3.1 TCP Is a Connection-Oriented Protocol
  • 3.2 How TCP Establishes A Connection
  • 3.3 UDP, TCP's "Connectionless" Cousin
  • 3.4 TCP and UDP Ports
  • 3.5 The TCP/IP "Time To Live" Feature
  • 3.6 The ICMP Protocol and Its Relationship to TCP/IP
• 4 How IP Addresses Are Used To Access Network Devices
  • 4.1 Private IP Addresses
  • 4.2 The localhost IP Address
  • 4.3 Network Address Translation (NAT) Makes Private IPs Public
  • 4.4 Port Forwarding with NAT Facilitates Home-Based Web sites
  • 4.5 DHCP
  • 4.6 How DNS Links Your IP Address To Your Web Domain
  • 4.7 IP Version 6 (IPv6)
• 5 How Subnet Masks Group IP Addresses into Networks
  • 5.1 Calculating The Number of Addresses Assigned to a Subnet
    • 5.1.1 Table 2-2: The "Dotted Decimal" And "Slash" Subnet Mask Notations
  • 5.2 Calculating the Range of Addresses on Your Network
    • 5.2.1 Manual Calculation
    • 5.2.2 Calculation Using a Script
  • 5.3 Subnet Masks for the Typical Business DSL Line
• 6 The Physical and Link Layers
• 7 Networking Equipment Terminology
  • 7.1 Network Interface Cards
    • 7.1.1 The Meaning of the NIC Link Light
    • 7.1.2 Duplex Explained
    • 7.1.3 The MAC Address
    • 7.1.4 How ARP Maps the MAC Address to Your IP Address
    • 7.1.5 Common ARP Problems When Changing A NIC
  • 7.2 The Two Broad Types Of Networking Equipment
    • 7.2.1 Data Terminal Equipment
    • 7.2.2 Data Communications Equipment
    • 7.2.3 Using Straight-Through/Crossover Cables to Connect DTEs And DCEs
    • 7.2.4 Table 2-3: Cabling Rules of Thumb
  • 7.3 Connectivity Using Hubs
  • 7.4 Using Switches as a Faster Alternative to Hubs
  • 7.5 Local Area Networks
  • 7.6 How Routers Interconnect LANs
  • 7.7 How Simple Routing Works
  • 7.8 Default Gateways, The Routers Of Last Resort
  • 7.9 Firewalls Help Provide a Secure Routing Environment
• 8 Additional Introductory Topics
  • 8.1 The File Transfer Protocol
  • 8.2 Linux Help
• 9 Conclusion