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Linux Networking Cookbook
This soup-to-nuts collection of recipes covers everything
you need to know to perform your job as a Linux network
administrator, whether you're new to the job or have years
of experience. With Linux Networking Cookbook, you'll dive
straight into the gnarly hands-on work of building and
maintaining a computer network.
Running
a network doesn't mean you have all the answers.
Networking is a complex subject with reams of reference
material that's difficult to keep straight, much less
remember. If you want a book that lays out the steps for
specific tasks, that clearly explains the commands and
configurations, and does not tax your patience with endless
ramblings and meanderings into theory and obscure RFCs, this
is the book for you.
You will find recipes for:
Building a gateway, firewall, and wireless access point on a
Linux network
Building a VoIP server with Asterisk
Secure remote administration with SSH
Building secure VPNs with OpenVPN, and a Linux PPTP VPN
server
Single sign-on with Samba for mixed Linux/Windows LANs
Centralized network directory with OpenLDAP
Network monitoring with Nagios or MRTG
Getting acquainted with IPv6
Setting up hands-free networks installations of new systems
Linux system administration via serial console
And a lot more. Each recipe includes a clear, hands-on
solution with tested code, plus a discussion on why it
works. When you need to solve a network problem without
delay, and don't have the time or patience to comb through
reference books or the Web for answers, Linux Networking
Cookbook gives you exactly what you need.
CONTENTS:
Preface
1. Introduction to Linux Networking
1.0 Introduction
2. Building a Linux Gateway on a Single-Board Computer
2.0 Introduction
2.1 Getting Acquainted with the Soekris 4521
2.2 Configuring Multiple Minicom Profiles
2.3 Installing Pyramid Linux on a Compact Flash Card
2.4 Network Installation of Pyramid on Debian
2.5 Network Installation of Pyramid on Fedora
2.6 Booting Pyramid Linux
2.7 Finding and Editing Pyramid Files
2.8 Hardening Pyramid
2.9 Getting and Installing the Latest Pyramid Build
2.10 Adding Additional Software to Pyramid Linux
2.11 Adding New Hardware Drivers
2.12 Customizing the Pyramid Kernel
2.13 Updating the Soekris comBIOS
3. Building a Linux Firewall
3.0 Introduction
3.1 Assembling a Linux Firewall Box
3.2 Configuring Network Interface Cards on Debian
3.3 Configuring Network Interface Cards on Fedora
3.4 Identifying Which NIC Is Which
3.5 Building an Internet-Connection Sharing Firewall on a Dynamic WAN IP Address
3.6 Building an Internet-Connection Sharing Firewall on a Static WAN IP Address
3.7 Displaying the Status of Your Firewall
3.8 Turning an iptables Firewall Off
3.9 Starting iptables at Boot, and Manually Bringing Your Firewall Up and Down
3.10 Testing Your Firewall
3.11 Configuring the Firewall for Remote SSH Administration
3.12 Allowing Remote SSH Through a NAT Firewall
3.13 Getting Multiple SSH Host Keys Past NAT
3.14 Running Public Services on Private IP Addresses
3.15 Setting Up a Single-Host Firewall
3.16 Setting Up a Server Firewall
3.17 Configuring iptables Logging
3.18 Writing Egress Rules
4. Building a Linux Wireless Access Point
4.0 Introduction
4.1 Building a Linux Wireless Access Point
4.2 Bridging Wireless to Wired
4.3 Setting Up Name Services
4.4 Setting Static IP Addresses from the DHCP Server
4.5 Configuring Linux and Windows Static DHCP Clients
4.6 Adding Mail Servers to dnsmasq
4.7 Making WPA2-Personal Almost As Good As WPA-Enterprise
4.8 Enterprise Authentication with a RADIUS Server
4.9 Configuring Your Wireless Access Point to Use FreeRADIUS
4.10 Authenticating Clients to FreeRADIUS
4.11 Connecting to the Internet and Firewalling
4.12 Using Routing Instead of Bridging
4.13 Probing Your Wireless Interface Card
4.14 Changing the Pyramid Router's Hostname
4.15 Turning Off Antenna Diversity
4.16 Managing dnsmasq's DNS Cache
4.17 Managing Windows' DNS Caches
4.18 Updating the Time at Boot
5. Building a VoIP Server with Asterisk
5.0 Introduction
5.1 Installing Asterisk from Source Code
5.2 Installing Asterisk on Debian
5.3 Starting and Stopping Asterisk
5.4 Testing the Asterisk Server
5.5 Adding Phone Extensions to Asterisk and Making Calls
5.6 Setting Up Softphones
5.7 Getting Real VoIP with Free World Dialup
5.8 Connecting Your Asterisk PBX to Analog Phone Lines
5.9 Creating a Digital Receptionist
5.10 Recording Custom Prompts
5.11 Maintaining a Message of the Day
5.12 Transferring Calls
5.13 Routing Calls to Groups of Phones
5.14 Parking Calls
5.15 Customizing Hold Music
5.16 Playing MP3 Sound Files on Asterisk
5.17 Delivering Voicemail Broadcasts
5.18 Conferencing with Asterisk
5.19 Monitoring Conferences
5.20 Getting SIP Traffic Through iptables NAT Firewalls
5.21 Getting IAX Traffic Through iptables NAT Firewalls
5.22 Using AsteriskNOW, "Asterisk in 30 Minutes"
5.23 Installing and Removing Packages on AsteriskNOW
5.24 Connecting Road Warriors and Remote Users
6. Routing with Linux
6.0 Introduction
6.1 Calculating Subnets with ipcalc
6.2 Setting a Default Gateway
6.3 Setting Up a Simple Local Router
6.4 Configuring Simplest Internet Connection Sharing
6.5 Configuring Static Routing Across Subnets
6.6 Making Static Routes Persistent
6.7 Using RIP Dynamic Routing on Debian
6.8 Using RIP Dynamic Routing on Fedora
6.9 Using Quagga's Command Line
6.10 Logging In to Quagga Daemons Remotely
6.11 Running Quagga Daemons from the Command Line
6.12 Monitoring RIPD
6.13 Blackholing Routes with Zebra
6.14 Using OSPF for Simple Dynamic Routing
6.15 Adding a Bit of Security to RIP and OSPF
6.16 Monitoring OSPFD
7. Secure Remote Administration with SSH
7.0 Introduction
7.1 Starting and Stopping OpenSSH
7.2 Creating Strong Passphrases
7.3 Setting Up Host Keys for Simplest Authentication
7.4 Generating and Copying SSH Keys
7.5 Using Public-Key Authentication to Protect System Passwords
7.6 Managing Multiple Identity Keys
7.7 Hardening OpenSSH
7.8 Changing a Passphrase
7.9 Retrieving a Key Fingerprint
7.10 Checking Configuration Syntax
7.11 Using OpenSSH Client Configuration Files for Easier Logins
7.12 Tunneling X Windows Securely over SSH
7.13 Executing Commands Without Opening a Remote Shell
7.14 Using Comments to Label Keys
7.15 Using DenyHosts to Foil SSH Attacks
7.16 Creating a DenyHosts Startup File
7.17 Mounting Entire Remote Filesystems with sshfs
8. Using Cross-Platform Remote Graphical Desktops
8.0 Introduction
8.1 Connecting Linux to Windows via rdesktop
8.2 Generating and Managing FreeNX SSH Keys
8.3 Using FreeNX to Run Linux from Windows
8.4 Using FreeNX to Run Linux from Solaris, Mac OS X, or Linux
8.5 Managing FreeNX Users
8.6 Watching Nxclient Users from the FreeNX Server
8.7 Starting and Stopping the FreeNX Server
8.8 Configuring a Custom Desktop
8.9 Creating Additional Nxclient Sessions
8.10 Enabling File and Printer Sharing, and Multimedia in Nxclient
8.11 Preventing Password-Saving in Nxclient
8.12 Troubleshooting FreeNX
8.13 Using VNC to Control Windows from Linux
8.14 Using VNC to Control Windows and Linux at the Same Time
8.15 Using VNC for Remote Linux-to-Linux Administration
8.16 Displaying the Same Windows Desktop to Multiple Remote Users
8.17 Changing the Linux VNC Server Password
8.18 Customizing the Remote VNC Desktop
8.19 Setting the Remote VNC Desktop Size
8.20 Connecting VNC to an Existing X Session
8.21 Securely Tunneling x11vnc over SSH
8.22 Tunneling TightVNC Between Linux and Windows
9. Building Secure Cross-Platform Virtual Private Networks with OpenVPN
9.0 Introduction
9.1 Setting Up a Safe OpenVPN Test Lab
9.2 Starting and Testing OpenVPN
9.3 Testing Encryption with Static Keys
9.4 Connecting a Remote Linux Client Using Static Keys
9.5 Creating Your Own PKI for OpenVPN
9.6 Configuring the OpenVPN Server for Multiple Clients
9.7 Configuring OpenVPN to Start at Boot
9.8 Revoking Certificates
9.9 Setting Up the OpenVPN Server in Bridge Mode
9.10 Running OpenVPN As a Nonprivileged User
9.11 Connecting Windows Clients
10. Building a Linux PPTP VPN Server
10.0 Introduction
10.1 Installing Poptop on Debian Linux
10.2 Patching the Debian Kernel for MPPE Support
10.3 Installing Poptop on Fedora Linux
10.4 Patching the Fedora Kernel for MPPE Support
10.5 Setting Up a Standalone PPTP VPN Server
10.6 Adding Your Poptop Server to Active Directory
10.7 Connecting Linux Clients to a PPTP Server
10.8 Getting PPTP Through an iptables Firewall
10.9 Monitoring Your PPTP Server
10.10 Troubleshooting PPTP
11. Single Sign-on with Samba for Mixed Linux/Windows LANs
11.0 Introduction
11.1 Verifying That All the Pieces Are in Place
11.2 Compiling Samba from Source Code
11.3 Starting and Stopping Samba
11.4 Using Samba As a Primary Domain Controller
11.5 Migrating to a Samba Primary Domain Controller from an NT4 PDC
11.6 Joining Linux to an Active Directory Domain
11.7 Connecting Windows 95/98/ME to a Samba Domain
11.8 Connecting Windows NT4 to a Samba Domain
11.9 Connecting Windows NT/2000 to a Samba Domain
11.10 Connecting Windows XP to a Samba Domain
11.11 Connecting Linux Clients to a Samba Domain with Command-Line Programs
11.12 Connecting Linux Clients to a Samba Domain with Graphical Programs
12. Centralized Network Directory with OpenLDAP
12.0 Introduction
12.1 Installing OpenLDAP on Debian
12.2 Installing OpenLDAP on Fedora
12.3 Configuring and Testing the OpenLDAP Server
12.4 Creating a New Database on Fedora
12.5 Adding More Users to Your Directory
12.6 Correcting Directory Entries
12.7 Connecting to a Remote OpenLDAP Server
12.8 Finding Things in Your OpenLDAP Directory
12.9 Indexing Your Database
12.10 Managing Your Directory with Graphical Interfaces
12.11 Configuring the Berkeley DB
12.12 Configuring OpenLDAP Logging
12.13 Backing Up and Restoring Your Directory
12.14 Refining Access Controls
12.15 Changing Passwords
13. Network Monitoring with Nagios
13.0 Introduction
13.1 Installing Nagios from Sources
13.2 Configuring Apache for Nagios
13.3 Organizing Nagios' Configuration Files Sanely
13.4 Configuring Nagios to Monitor Localhost
13.5 Configuring CGI Permissions for Full Nagios Web Access
13.6 Starting Nagios at Boot
13.7 Adding More Nagios Users
13.8 Speed Up Nagios with check_icmp
13.9 Monitoring SSHD
13.10 Monitoring a Web Server
13.11 Monitoring a Mail Server
13.12 Using Servicegroups to Group Related Services
13.13 Monitoring Name Services
13.14 Setting Up Secure Remote Nagios Administration with OpenSSH
13.15 Setting Up Secure Remote Nagios Administration with OpenSSL
14. Network Monitoring with MRTG
14.0 Introduction
14.1 Installing MRTG
14.2 Configuring SNMP on Debian
14.3 Configuring SNMP on Fedora
14.4 Configuring Your HTTP Service for MRTG
14.5 Configuring and Starting MRTG on Debian
14.6 Configuring and Starting MRTG on Fedora
14.7 Monitoring Active CPU Load
14.8 Monitoring CPU User and Idle Times
14.9 Monitoring Physical Memory
14.10 Monitoring Swap Space and Memory
14.11 Monitoring Disk Usage
14.12 Monitoring TCP Connections
14.13 Finding and Testing MIBs and OIDs
14.14 Testing Remote SNMP Queries
14.15 Monitoring Remote Hosts
14.16 Creating Multiple MRTG Index Pages
14.17 Running MRTG As a Daemon
15. Getting Acquainted with IPv6
15.0 Introduction
15.1 Testing Your Linux System for IPv6 Support
15.2 Pinging Link Local IPv6 Hosts
15.3 Setting Unique Local Unicast Addresses on Interfaces
15.4 Using SSH with IPv6
15.5 Copying Files over IPv6 with scp
15.6 Autoconfiguration with IPv6
15.7 Calculating IPv6 Addresses
15.8 Using IPv6 over the Internet
16. Setting Up Hands-Free Network Installations of New Systems
16.0 Introduction
16.1 Creating Network Installation Boot Media for Fedora Linux
16.2 Network Installation of Fedora Using Network Boot Media
16.3 Setting Up an HTTP-Based Fedora Installation Server
16.4 Setting Up an FTP-Based Fedora Installation Server
16.5 Creating a Customized Fedora Linux Installation
16.6 Using a Kickstart File for a Hands-off Fedora Linux Installation
16.7 Fedora Network Installation via PXE Netboot
16.8 Network Installation of a Debian System
16.9 Building a Complete Debian Mirror with apt-mirror
16.10 Building a Partial Debian Mirror with apt-proxy
16.11 Configuring Client PCs to Use Your Local Debian Mirror
16.12 Setting Up a Debian PXE Netboot Server
16.13 Installing New Systems from Your Local Debian Mirror
16.14 Automating Debian Installations with Preseed Files
17. Linux Server Administration via Serial Console
17.0 Introduction
17.1 Preparing a Server for Serial Console Administration
17.2 Configuring a Headless Server with LILO
17.3 Configuring a Headless Server with GRUB
17.4 Booting to Text Mode on Debian
17.5 Setting Up the Serial Console
17.6 Configuring Your Server for Dial-in Administration
17.7 Dialing In to the Server
17.8 Adding Security
17.9 Configuring Logging
17.10 Uploading Files to the Server
18. Running a Linux Dial-Up Server
18.0 Introduction
18.1 Configuring a Single Dial-Up Account with WvDial
18.2 Configuring Multiple Accounts in WvDial
18.3 Configuring Dial-Up Permissions for Nonroot Users
18.4 Creating WvDial Accounts for Nonroot Users
18.5 Sharing a Dial-Up Internet Account
18.6 Setting Up Dial-on-Demand
18.7 Scheduling Dial-Up Availability with cron
18.8 Dialing over Voicemail Stutter Tones
18.9 Overriding Call Waiting
18.10 Leaving the Password Out of the Configuration File
18.11 Creating a Separate pppd Logfile
19. Troubleshooting Networks
19.0 Introduction
19.1 Building a Network Diagnostic and Repair Laptop
19.2 Testing Connectivity with ping
19.3 Profiling Your Network with FPing and Nmap
19.4 Finding Duplicate IP Addresses with arping
19.5 Testing HTTP Throughput and Latency with httping
19.6 Using traceroute, tcptraceroute, and mtr to Pinpoint NetworkProblems
19.7 Using tcpdump to Capture and Analyze Traffic
19.8 Capturing TCP Flags with tcpdump
19.9 Measuring Throughput, Jitter, and Packet Loss with iperf
19.10 Using ngrep for Advanced Packet Sniffing
19.11 Using ntop for Colorful and Quick Network Monitoring
19.12 Troubleshooting DNS Servers
19.13 Troubleshooting DNS Clients
19.14 Troubleshooting SMTP Servers
19.15 Troubleshooting a POP3, POP3s, or IMAP Server
19.16 Creating SSL Keys for Your Syslog-ng Server on Debian
19.17 Creating SSL Keys for Your Syslog-ng Server on Fedora
19.18 Setting Up stunnel for Syslog-ng
19.19 Building a Syslog Server
A. Essential References
B. Glossary of Networking Terms
C. Linux Kernel Building Reference
Index
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