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9.4.1 Administrating On a Web Interface: webmin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 9.4.2 Configuring Packages: debconf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199 9.5 syslog System Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 9.5.1 Principle and Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 9.5.2 The Configuration File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 9.5.2.1 Syntax of the Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 9.5.2.2 Syntax of Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 9.6 The inetd Super-Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 9.7 Scheduling Tasks with cron and atd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204 9.7.1 Format of a crontab File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 9.7.2 Using the at Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207 9.8 Scheduling Asynchronous Tasks: anacron . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 9.9 otas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 9.10 Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 9.10.1 Backing Up with rsync . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 9.10.2 Restoring Machines without Backups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212 9.11 Hot Plugging: hotplug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 9.11.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 9.11.2 The Naming Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 9.11.3 How udev Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214 9.11.4 A concrete example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216 9.12 Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218 9.12.1 Advanced Power Management (APM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218 9.12.2 Modern power savings: Advanced Configuration and Power Interface (AC<strong>PI</strong>) . . . . . . . . . . . 218 9.13 Laptop Extension Cards: PCMCIA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219 10. Network Infrastructure 221 10.1 Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222 10.2 Virtual Private Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224 10.2.1 OpenVPN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224 10.2.1.1 Public Key Infrastructure: easy-rsa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225 10.2.1.2 Configuring the OpenVPN Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229 10.2.1.3 Configuring the OpenVPN Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229 10.2.2 Virtual Private Network with SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 10.2.3 IPsec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 10.2.4 PPTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231 10.2.4.1 Configuring the Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231 10.2.4.2 Configuring the Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232 10.3 ality of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235 10.3.1 Principle and Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235 10.3.2 Configuring and Implementing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236 10.3.2.1 Reducing Latencies: wondershaper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236 10.3.2.2 Standard Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237 10.4 Dynamic Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237 VIII The Debian Administrator's Handbook
10.5 IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238 10.6 Domain Name Servers (DNS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240 10.6.1 Principle and Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240 10.6.2 Configuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241 10.7 DHCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243 10.7.1 Presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243 10.7.2 Configuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244 10.7.3 DHCP and DNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245 10.8 Network Diagnosis Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245 10.8.1 Local Diagnosis: netstat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246 10.8.2 Remote Diagnosis: nmap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247 10.8.3 Sniffers: tcpdump and wireshark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248 11. Network Services: Postfix, Apache, NFS, Samba, Squid, LDAP 251 11.1 Mail Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 11.1.1 Installing Postfix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 11.1.2 Configuring Virtual Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255 11.1.2.1 Virtual Alias Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255 11.1.2.2 Virtual Mailbox Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256 11.1.3 Restrictions for Receiving and Sending . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257 11.1.3.1 IP-Based Access Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258 11.1.3.2 Checking the Validity of the EHLO or HELO Commands . . . . . . . . . . . . . . . . . . . . . 259 11.1.3.3 Accepting or Refusing Based on the Announced Sender . . . . . . . . . . . . . . . . . . . . . 260 11.1.3.4 Accepting or Refusing Based on the Recipient . . . . . . . . . . . . . . . . . . . . . . . . . . 260 11.1.3.5 Restrictions Associated with the DATA Command . . . . . . . . . . . . . . . . . . . . . . . . 261 11.1.3.6 Applying Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261 11.1.3.7 Filtering Based on the Message Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261 11.1.4 Seing Up greylisting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262 11.1.5 Customizing Filters Based On the Recipient . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264 11.1.6 Integrating an Antivirus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265 11.1.7 Authenticated SMTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266 11.2 Web Server (HTTP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268 11.2.1 Installing Apache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268 11.2.2 Configuring Virtual Hosts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269 11.2.3 Common Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271 11.2.3.1 Requiring Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272 11.2.3.2 Restricting Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273 11.2.4 Log Analyzers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273 11.3 FTP File Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275 11.4 NFS File Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276 11.4.1 Securing NFS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276 11.4.2 NFS Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278 11.4.3 NFS Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279 Contents IX
Page 2 and 3: The Debian Administrator's Handbook
Page 4 and 5: 3.1.3 Integration with Other Linux/
Page 6 and 7: 6.5 Checking Package Authenticity .
Page 10 and 11: 11.5 Seing Up Windows Shares with S
Page 12 and 13: 14.2 Firewall or Packet Filtering .
Page 14 and 15: B.2.2 The User's Home Directory . .
Page 17 and 18: Foreword Linux has been garnering s
Page 19 and 20: Book Structure Following the struct
Page 21 and 22: While we were obviously satisfied w
Page 23 and 24: Tobias Gruetzmacher, Tournier Simon
Page 26 and 27: Keywords Objective Means Operation
Page 28 and 29: 1.1. What Is Debian? CULTURE Origin
Page 30 and 31: TOOL Installer debian-installer is
Page 32 and 33: COMMUNITY Upstream author, or Debia
Page 34 and 35: ➨ http://www.opensource.org/licen
Page 36 and 37: 1.3.1. The Debian Developers Debian
Page 38 and 39: with the changelog.gz file (or equi
Page 40 and 41: were only lile challenges at the be
Page 42 and 43: can always fine-tune these paramete
Page 44 and 45: PERSPECTIVE Debian for multimedia A
Page 46 and 47: Each specific service has its own s
Page 48 and 49: tool. Whether used in graphical or
Page 50 and 51: Figure 1.2 Compilation of a package
Page 52 and 53: their work. The next step is the in
Page 54 and 55: 28 The Debian Administrator's Handb
Page 56 and 57: Keywords Falcot Corp SMB Strong Gro
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We have envisioned this case study
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Several factors have dictated this
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• A survey of several French serv
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Chapter Analyzing the Existing Setu
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Figure 3.1 Coexistence of Debian wi
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Figure 3.2 Database backups Each se
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HARDWARE Next-generation PC Most re
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Keywords Installation Partitioning
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BACK TO BASICS A catch-up course in
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copy the previously downloaded ISO
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of the two, and GRUB, a more modern
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Figure 4.3 Selecting the country 4.
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4.2.9. Configuring the Clock If the
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(swap) will be stored. This task is
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Figure 4.9 Guided partitioning The
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IN PRACTICE Shrinking a Windows par
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“Create a volume group”, to whi
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Figure 4.12 Selecting a Debian mirr
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accessible from the boot menu. You
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TIP Debian thinks of speakers of no
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Chapter Packaging System: Tools and
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Chapter 7, Solving Problems and Fin
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SHA1: 350a8a7a43fe182d54f3b7d73b803
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5.2.1.2. Conflicts: the Conflicts f
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Figure 5.1 Use of a Provides field
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name. This directory also includes
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postinst and similar scripts. But t
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-----BEGIN PGP SIGNED MESSAGE-----
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and a set of upstream patches contr
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Updating database of manual pages .
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which the file comes; --status pack
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Iceweasel is a redesign of the Mozi
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handles other packaging formats, es
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Chapter Maintenance and Updates: Th
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The syntax of the last field depend
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6.1.1.2. The Backports From backpor
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6.2.1. Initialization For any work
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6.2.3. System Upgrade Regular upgra
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it can be configured through severa
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TIP Comments in /etc/apt/ preferenc
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6.4. Frontends: aptitude, synaptic
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like aptitude has always done. It c
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aptitude's log will only contain a
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“Authentication” tab in the Sei
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compiled by the package maintainers
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Figure 6.3 Upgrading with update-ma
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IN PRACTICE The Falcot Corp case Fa
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purpose is editing. Browsing this c
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Chapter Solving Problems and Findin
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Man pages not only document program
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The navigation controls in the docu
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constraints... 7.2. Common Procedur
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7.2.3. Asking for Help on a Mailing
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Keywords Configuration Localization
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This chapter reviews everything inc
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The questions are relevant to the p
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to 1 Gb/s). The most widely used ca
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A connection by telephone modem req
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Network Manager knows how to handle
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TIP Bypassing DNS Since application
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8.4.3. Modifying an Existing Accoun
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The creation of an account populate
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8.7. Printer Configuration Printer
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Configuration of the bootloader mus
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oot=/dev/sda # the partition that c
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kernel /vmlinuz root=/dev/sda2 init
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The timezone, configured during ini
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GOING FURTHER GPS modules and other
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A complete list of known filesystem
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8.10.1. Introduction and Prerequisi
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the choices saved in the .config fi
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$ ls ../*.deb ../linux-image-2.6.32
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This requires, however, that lilo b
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Chapter Unix Services 9 Contents Sy
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• checking the integrity of files
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By default, Debian uses four differ
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BACK TO BASICS Client, server A sys
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that requires frequent connections
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For any connection established on t
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When the VNC session is closed, rem
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There are two ways of presenting ri
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Webmin is used through a web interf
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• news: Usenet subsystem message
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9.6. The inetd Super-Server Inetd (
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SECURITY Restricting cron or atd Yo
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# Restart the IRC proxy after each
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update the quotas in the absence of
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of backups can be kept in a small a
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The Falcot Corp administrators are
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• ACTION: the action correspondin
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ATTRS{rev}==" " ATTRS{state}=="runn
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ATTENTION Graphics card and standby
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Chapter Network10 Infrastructure Co
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sent through to the masqueraded con
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CULTURE SSL and TLS The SSL protoco
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crt for the public certificate, key
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10.2.1.2. Configuring the OpenVPN S
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fast. Installing an IKE daemon (for
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pptpd is the PPTP server for Linux.
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## some defaults nodefaultroute pro
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GOING FURTHER Optimal configuration
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# (/proc/sys/net/ipv6/conf/all/acce
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so that a security vulnerability in
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Example 10.12 Excerpt of /etc/bind/
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} option broadcast-address 192.168.
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10.8.2. Remote Diagnosis: nmap nmap
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The packet currently displayed was
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Chapter 11 Network Services: Postfi
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the ISP's SMTP server, which is alw
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alias_database = hash:/etc/aliases
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virtual_mailbox_base = /var/mail/vh
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The last two rules reject any messa
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The reject_unlisted_recipient rule
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failed messages later), especially
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# Unfiltered addresses postmaster@f
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Note that the SASL database was cre
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Apache is a modular server, and man
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# New log format including (virtual
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11.2.3.2. Restricting Access The Al
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➨ http://www.falcot.com/cgi-bin/a
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RPC services register to a director
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option, which disables this behavio
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The package also proposes identifyi
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1 5 Specifies the character set and
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username = user password = password
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11.6.3. Configuring a Filter squid
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objectClass: dcObject objectClass:
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Question Answer LDAP server Uniform
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and so on). The answer to the “co
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go into deeper detail for some conc
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Chapter Advanced12 Administration C
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CULTURE Independent or inexpensive?
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RAID-5 RAID-5 addresses the asymmet
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Filesystem label= OS type: Linux Bl
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there will be a synchronization pha
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[...] Update Time : Thu Sep 30 15:5
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Fortunately, these lines can be gen
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# pvdisplay "/dev/sdb2" is a new ph
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Allocation inherit Read ahead secto
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# cat /etc/fstab [...] /dev/vg_crit
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[...] # df -h /srv/base/ Filesystem
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• The remaining partitions, sda7
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that gets started) is known as dom0
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or Mandriva). Other methods include
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# xm list Name ID Mem VCPUs State T
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known as control groups, by which d
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into a separate switch, with the co
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done. INIT: Entering runlevel: 3 St
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12.2.3.2. Network Configuration Jus
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is accessible from all interfaces;
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We will only give a rough overview
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• from the network; preseeding th
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12.3.3. Simple-CDD: The All-In-One
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12.4. Monitoring Monitoring is a ge
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Finally, when a plugin is invoked w
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According to its type, each object
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check_command } define service{ use
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Keywords Workstation Graphical desk
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13.1. Configuring the X11 Server Th
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oth versions are available in Squee
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contains commented examples. Last,
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Figure 13.2 The KDE desktop Since t
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Evolution is the GNOME email client
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Strictly speaking, Debian Squeeze c
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The next versions of these applicat
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13.4.4.3. Collaborative Work With F
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The Windows partition must first be
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Chapter Security14 Contents Definin
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ut the other elements should also b
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• INPUT: concerns packets whose d
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Other actions, particularly those c
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Figure 14.2 Fwbuilder's main window
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• those that qualify a message as
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14.3.3.1. Auditing Packages: debsum
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The chkrootkit and rkhunter package
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Figure 14.3 Security contexts and U
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The aptitude install selinux-basics
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# semanage login -a -s user_u rhert
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# myapp executable will have: # lab
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GOING FURTHER The m4 macro language
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Message avc:denied { read write } p
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➨ http://en.wikipedia.org/wiki/SQ
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features imply a increased risk of
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confronted with these unfortunate c
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sure of actually fixing it; otherwi
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(...) ** 2004-11-29-19:50:49: DCC S
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Chapter Creating a Debian15 Package
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editor shows us that dch really did
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15.2. Building your First Package 1
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particular case, library, is useful
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The interpretation of such a rule i
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ALTERNATIVE apt-ftparchive If mini-
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a huge problem as soon as the error
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EXTRA Lightweight process for “De
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not yet gone through the new mainta
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Chapter Debian's16 Conclusion: Futu
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16.3. Future of this Book We would
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These objectives necessarily involv
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A.7. Damn Small Linux This distribu
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$ pwd /home/rhertzog $ cd Desktop $
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tmpfs 514208 269136 245072 53% /dev
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B.3.1. The Deepest Layer: the Hardw
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B.4. Some Tasks Handled by the Kern
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B.4.3. Shared Functions Since a num
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comes back when the execution of th
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• the standard C library (glibc),
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alternative, 356 am-utils, 173 aman
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Collins, Ben, 12 command line inter
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edquota, 209 eGroupware, 366 EHLO,
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in-addr.arpa, 241 Includes, Apache
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lspci, 444 lspcmcia, 444 lsusb, 444
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hardware acceleration, 190 openswan
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ead, right, 196 README.Debian, 11,
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suite, office, 368 super-server, 20
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Z Zabbix, 343 Zacchiroli, Stefano,
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