9780596005481

As one of the most successful books to come from the Linux Documentation Project, the Linux Network Administrator's Guide offers everything that people need to know for setting up and supporting versatile networking systems with Linux. Our fully updated third edition covers some hardware considerations along with all of the essential networking software that comes with the operating system-including basic infrastructure (like TCP/IP, Wi-Fi wireless networking, and firewalling), and the most popular services on Linux systems. New topics include wireless hubs, OpenLDAP, FreeS/WAN, and IMAP, spam filtering, OpenSSH, BIND, and Ipv6.

Tony Bautts is an independent security consultant who has worked with Fortune 500 companies in the US and Japan. He has spoken at security-related events for The Information Systems Audit and Control Association (ISACA) and has spoken and chaired events for the MIS Training Institute. Tony is the co-author of Hack Proofing Your Wireless Network, Nokia Network Solutions Handbook, and the Security Certification Handbook and has, additionally, served as technical reviewer for Implementing IPv6 on Cisco IOS by Syngress Publishing.

Terry Dawson is an amateur radio operator and long time Linux enthusiast. He is the author of a number of network related HOWTO documents for the Linux Documentation Project, co-author the 2nd edition of O'Reilly's Linux Network Administrators Guide and is an active participant in a number of other Linux projects. Terry has 15 years professional experience in telecommunications and is currently engaged in network management research in the Telstra Research Laboratories.

Gregor N. Purdy is engineering manager in the large account services group at Amazon.com. Before joining Amazon.com in 2003, Gregor worked for ten years as a consultant in high-end data warehousing, system integration, and prior art research in software and Internet patents. He has also contributed to a number of open source projects, including Perl core and extension modules, the Perl Shell, and the Parrot virtual machine for Perl 6.

Preface

ix

Introduction to Networking

1

(15)

History

1

(1)

TCP/IP Networks

2

(9)

Linux Networking

11

(2)

Maintaining Your System

13

(3)

Issues of TCP/IP Networking

16

(13)

Networking Interfaces

16

(1)

IP Addresses

17

(9)

The Internet Control Message Protocol

26

(3)

Configuring the Serial Hardware

29

(13)

Communications Software for Modem Links

29

(1)

Accessing Serial Devices

30

(4)

Using the Configuration Utilities

34

(4)

Serial Devices and the login: Prompt

38

(4)

Configuring TCP/IP Networking

42

(24)

Understanding the /proc Filesystem

43

(23)

Name Service and Configuration

66

(30)

The Resolver Library

67

(4)

How DNS Works

71

(21)

Alternatives to BIND

92

(4)

The Point-to-Point Protocol

96

(23)

PPP on Linux

97

(1)

Running PPPD

98

(1)

Using Options Files

99

(1)

Using chat to Automate Dialing

100

(2)

IP Configuration Options

102

(3)

Link Control Options

105

(2)

General Security Considerations

107

(1)

Authentication with PPP

108

(4)

Debugging Your PPP Setup

112

(1)

More Advanced PPP Configurations

112

(4)

PPPoE Options in Linux

116

(3)

TCP/IP Firewall

119

(27)

Methods of Attack

120

(2)

What Is a Firewall?

122

(2)

What Is IP Filtering?

124

(1)

Netfilter and iptables

125

(2)

iptables Concepts

127

(6)

Setting Up Linux for Firewalling

133

(1)

Using iptables

134

(2)

The iptables Subcommands

136

(1)

Basic iptables Matches

137

(4)

A Sample Firewall Configuration

141

(3)

References

144

(2)

IP Accounting

146

(8)

Configuring the Kernel for IP Accounting

146

(1)

Configuring IP Accounting

146

(5)

Using IP Accounting Results

151

(1)

Resetting the Counters

151

(1)

Flushing the Rule Set

152

(1)

Passive Collection of Accounting Data

152

(2)

IP Masquerade and Network Address Translation

154

(6)

Side Effects and Fringe Benefits

156

(1)

Configuring the Kernel for IP Masquerade

157

(1)

Configuring IP Masquerade

157

(1)

Handling Nameserver Lookups

158

(1)

More About Network Address Translation

159

(1)

Important Network Features

160

(19)

The inetd Super Server

160

(3)

The tcpd Access Control Facility

163

(1)

The xinetd Alternative

164

(3)

The Services and Protocols Files

167

(2)

Remote Procedure Call

169

(1)

Configuring Remote Login and Execution

170

(9)

Administration Issues with Electronic Mail

179

(7)

What Is a Mail Message?

180

(2)

How Is Mail Delivered?

182

(1)

Email Addresses

183

(1)

How Does Mail Routing Work?

184

(1)

Mail Routing on the Internet

184

(2)

sendmail

186

(47)

Installing the sendmail Distribution

186

(6)

sendmail Configuration Files

192

(6)

sendmail.cf Configuration Language

198

(5)

Creating a sendmail Configuration

203

(7)

sendmail Databases

210

(12)

Testing Your Configuration

222

(5)

Running sendmail

227

(1)

Tips and Tricks

228

(3)

More Information

231

(2)

Configuring IPv6 Networks

233

(11)

The IPv4 Problem and Patchwork Solutions

234

(1)

IPv6 as a Solution

235

(9)

Configuring the Apache Web Server

244

(14)

Apache HTTPD Server---An Introduction

244

(1)

Configuring and Building Apache

244

(3)

Configuration File Options

247

(3)

VirtualHost Configuration Options

250

(2)

Apache and OpenSSL

252

(4)

Troubleshooting

256

(2)

IMAP

258

(8)

IMAP---An Introduction

258

(5)

Cyrus IMAP

263

(3)

Samba

266

(12)

Samba---An Introduction

266

(12)

OpenLDAP

278

(16)

Understanding LDAP

278

(2)

Obtaining OpenLDAP

280

(14)

Wireless Networking

294

(15)

History

294

(1)

The Standards

295

(1)

802.11b Security Concerns

296

(13)

Appendix: Example Network: The Virtual Brewery

309

(2)

Index

311

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LINUX Network Administrator's Guide

LINUX Network Administrator's Guide

0596005482

Summary

Author Biography

Table of Contents

Supplemental Materials

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