Networking for Systems Administrators (IT Mastery Book 5) by Lucas, Michael W. -- Read -- Imperial Library of Trantor

Index

Title Page Contents More Tech Books from Michael W Lucas Acknowledgements Chapter 0: The Problem

Who Should Read This Book? Server versus Network Device A Note to Network Administrators Network Tools

ifconfig, route and ipconfig grep and findstr netstat lsof route tcpdump and Wireshark netcat traceroute host and nslookup

Book Contents

Chapter 1: Network Layers

Common Network Layers

Layer 1: Physical Layer 2: Datalink Layer 3: Network Layer 4: Transport Higher Layers

Layering in Practice Layers and Troubleshooting

Physical Troubleshooting Datalink Troubleshooting Network Troubleshooting Transport Troubleshooting

Chapter 2: Ethernet

Speed and Duplex Fragments and MTU Ethernet Wires Testing Ethernet: ping The Address Resolution Protocol

The ARP Cache Viewing the ARP Cache Missing ARP Empty ARP

Neighbor Discovery

Windows ND Unix ND

VLANs: One Cable, Multiple LANs

Virtual LANs VLAN Terminology

Datalink Errors

Windows Unix Current or Old Errors?

Configuring Ethernet

Chapter 3: IPv4

IPv4 Addresses Netmasks and Network Size

Valid Netmasks Unusable IPv4 Addresses Routers & the Default Gateway Netmasks versus LANs and Gateways

Viewing IP Configuration

ipconfig ifconfig and route

Multihoming and IP Aliases Loopback and Localhost Private Addresses and NAT Troubleshooting IP

Chapter 4: IPv6

IPv6 Essentials

Writing IPv6 Addresses IPv6 Netmasks IPv6 Autoconfiguration Localhost Address Link-Local Addresses

Viewing IPv6 Addresses

ipconfig ifconfig and route

IPv6 Network Address Translation Tunnels IPv4 versus IPv6

Chapter 5: TCP/IP

ICMP UDP TCP Protocol Roles and Troubleshooting Logical Ports

Source and Destination Ports Combining Ports and IP Addresses The Services File Sockets Network Daemons and the Root User

TCP Connection State

The Three-Way Handshake TCP Failures

More Protocols

Chapter 6: Viewing Network Connections

Hostnames and Netstat Netstat Display

Netstat Display Headers Reading Netstat Entries

Windows Netstat

Live Ports Show Only TCP or UDP Viewing Only Open Sockets What’s Listening to the Network?

Unix Netstat

Live Ports Show Only TCP or UDP Show Only Established Connections Show Only Listening Sockets What’s Listening On That Port?

Chapter 7: Network Testing Basics

Network Testing Etiquette Reporting Problems Network Manglers and Blockers

Chapter 8: the Domain Name System

DNS Principles

Domains and Zones Authoritative and Recursive DNS The DNS Hierarchy Forward and Reverse DNS DNS Record Types DNS Caching Why Check DNS?

Running DNS Queries

DNS Response Codes Windows and nslookup Unix and host Advanced DNS Queries

The Hosts File

Hosts Files Problems Name Resolution Order

Other Information Sources Disabling DNS

Chapter 9: Packet Sniffing

Packet Sniffers

tcpdump Wireshark Packet Sniffer Security Packet Sniffer Interfaces

Encryption and Packet Sniffers Using tcpdump

Identifying Interfaces Your First tcpdump

Reading UDP Packets Reading TCP Packets

TCP Flags in tcpdump Our First TCP Connection TCP When Nobody Answers Successful TCP

Reading ARP Other Traffic Filtering Captures

Filter Format Capturing ARP Traffic Filtering by IP Addresses Capturing by TCP and UDP Ports

Capture Files

Capturing to a File Reading a Capture File

Chapter 10: Creating Traffic

Netcat and Security Which Netcat Connecting with Netcat

Connecting with TCP Connecting with UDP Netcat Errors

Listening with Netcat

TCP listeners UDP Listeners

Sending Files With Netcat More Netcat Fun

Chapter 11: Server Packet Filtering

Network Intrusions

Organizational Intruders Single Server Intruders

Server Packet Filtering

Filtering Inbound Traffic Filtering Outbound Traffic

Packet Filtering Configurations

Chapter 12: Tracing Problems

Our First Traceroute Traceroute Errors

Slow Traces “starring out” Time Spikes Time Jumps Multiple Hosts at One Hop ! Errors

Identifying Address and Domain Owners Asymmetric Routing and Traceroute Servers Ongoing Traceroute: mtr How Should You Use Traceroute?

Afterword About the Author Copyright Information Table of Contents

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