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Barracuda Networks Inc.
3175 S. WInchester Blvd
Campbell, CA 95008
http://www.barracuda.com
Barracuda Web Filter Administrator’s Guide
Version 3.3
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Strany 1 - Campbell, CA 95008

1Barracuda Networks Inc.3175 S. WInchester BlvdCampbell, CA 95008http://www.barracuda.comBarracuda Web Filter Administrator’s GuideVersion 3.3

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Barracuda Web Filter Release 3.310 Chapter 1: IntroductionThe following figure shows how Barracuda Central provides the latest rules and definitions t

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Administrator’s GuideDeploying the Barracuda Web Filter 11Deploying the Barracuda Web FilterYou can deploy your Barracuda Web Filter so it is either

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Barracuda Web Filter Release 3.312 Chapter 1: IntroductionFigure 1.2: Inline Pass-through Deployment

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Administrator’s GuideDeploying the Barracuda Web Filter 13Forward proxyThe forward proxy deployment uses a proxy as an intermediary between a client

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Barracuda Web Filter Release 3.314 Chapter 1: IntroductionFigure 1.3: Forward Proxy Deployment

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15Chapter 2Installation and ConfigurationThis chapter provides general instructions for installing the Barracuda Web Filter.This chapter covers the fo

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Barracuda Web Filter Release 3.316 Chapter 2: Installation and ConfigurationNetwork considerations The Barracuda Web Filter appliance is a low-risk de

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Administrator’s GuideNetwork considerations 17Firewall DMZA demilitarized zone (DMZ) is an area where any servers that access the Internet are placed

Strany 10 - 10 Chapter 1: Introduction

Barracuda Web Filter Release 3.318 Chapter 2: Installation and ConfigurationInstalling and configuring the Barracuda Web FilterThese are the general s

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Administrator’s GuideInstalling and configuring the Barracuda Web Filter 19Figure 2.1: Connecting the Barracuda Web Filter to your NetworkThe Barracu

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2 Barracuda Web Filter Administrator’s GuideCopyright NoticeCopyright 2004-2008, Barracuda Networkswww.barracuda.comv33-080413-01-0413 All rights

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Barracuda Web Filter Release 3.320 Chapter 2: Installation and ConfigurationTo set a new IP address from the administrative console:1. Connect your ke

Strany 14 - 14 Chapter 1: Introduction

Administrator’s GuideInstalling and configuring the Barracuda Web Filter 21To configure the Barracuda Web Filter:1. From a Web browser, enter the IP

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Barracuda Web Filter Release 3.322 Chapter 2: Installation and ConfigurationUpdating the firmware may take several minutes. Do not turn off the unit d

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Administrator’s GuideInstalling and configuring the Barracuda Web Filter 233.Enable your subscription: 3a. Click the Activate link as shown in Figure

Strany 17 - Internal servers

Barracuda Web Filter Release 3.324 Chapter 2: Installation and ConfigurationStep 10. Test and adjust the Barracuda Web FilterAfter connecting your Bar

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Administrator’s GuideInstalling and configuring the Barracuda Web Filter 25Figure 2.4: Connecting the Barracuda Web Filter to your Network2. Connect

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Barracuda Web Filter Release 3.326 Chapter 2: Installation and ConfigurationAdvanced installation topicsThis section describes advanced installation t

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Administrator’s GuideAdvanced installation topics 27Figure 2.5: Inline Passthrough with Pre-existing Proxy Server DeploymentSupported pre-existing pr

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Barracuda Web Filter Release 3.328 Chapter 2: Installation and Configurationthe default port 80, this method captures most of the HTTP request traffic

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Administrator’s GuideAdvanced installation topics 29Figure 2.6: Proxy Behind the Barracuda Web Filter2. Connect the Ethernet cable from your WAN port

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Administrator’s Guide 3ContentsChapter 1 – Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 7Overview . . . . . . . . . . .

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Barracuda Web Filter Release 3.330 Chapter 2: Installation and Configuration

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31Chapter 3Configuring, Monitoring, and Managing theBarracuda Web FilterThis chapter describes the configuration, monitoring, and management tasks you

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Barracuda Web Filter Release 3.332 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web FilterConfiguring the Barracuda Web FilterThis s

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Administrator’s GuideConfiguring the Barracuda Web Filter 334.From the ADVANCED > Linked Management on Barracuda Web Filter 2:4a. Enter the Cluste

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Barracuda Web Filter Release 3.334 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web FilterSwitching a system to standby modeYou can

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Administrator’s GuideConfiguring the Barracuda Web Filter 35Enabling and disabling virus protectionUse the BASIC > Virus Checking page to turn off

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Barracuda Web Filter Release 3.336 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web FilterCreating block and accept filtersThis sect

Strany 31 - Barracuda Web Filter

Administrator’s GuideCreating block and accept filters 37Figure 3.2: Block Message with Login FieldsFiltering and blocking featuresThis section descr

Strany 32 - Setting up linked management

Barracuda Web Filter Release 3.338 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web FilterYou can use the Applications filter as a p

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Administrator’s GuideCreating block and accept filters 39MIME type blockingUse the BLOCK/ACCEPT > MIME Blocking page to specify standard MIME type

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Barracuda Web Filter Release 3.34:Setting up linked management . . . . . . . . . . . . . . . . . . . . . . . . . 32Data prop

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Barracuda Web Filter Release 3.340 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web FilterAbout the Barracuda Spyware Removal ToolTh

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Administrator’s GuideCreating block and accept filters 41Or you may want to create an exception policy that allows a subset of your users to access c

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Barracuda Web Filter Release 3.342 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web FilterLimitations for HTTPS traffic filteringWhe

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Administrator’s GuideMonitoring the Barracuda Web Filter 43Monitoring the Barracuda Web FilterThis section describes the monitoring tasks you can per

Strany 39 - Block messages

Barracuda Web Filter Release 3.344 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web FilterFigure 3.3: Indicator LightsTable 3.2 desc

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Administrator’s GuideMonitoring the Barracuda Web Filter 45You can perform the following operations on the Log page:• Apply filters to locate specifi

Strany 41 - HTTPS filtering option

Barracuda Web Filter Release 3.346 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web FilterAutomating the delivery of system alerts a

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Administrator’s GuideMonitoring the Barracuda Web Filter 47Some of the tasks that the Barracuda Web Filter tracks include:• Linked management setup•

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Barracuda Web Filter Release 3.348 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web FilterManaging the Barracuda Web FilterThis sect

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Administrator’s GuideManaging the Barracuda Web Filter 49We recommend that the Automatically Update setting for your spyware and virus definitions be

Strany 45 - Viewing the application log

Administrator’s Guide 5Chapter 4 – Managing Users and Groups . . . . . . . . . . . . . . 53Overview . . . . . . . . . . . . . . . . .

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Barracuda Web Filter Release 3.350 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web FilterRebooting the system in recovery modeIf yo

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Administrator’s GuideManaging the Barracuda Web Filter 51Reboot optionsTable 3.3 describes the options available at the reboot menu.Table 3.3: Reboot

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Barracuda Web Filter Release 3.352 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web Filter

Strany 49 - Replacing a failed system

53Chapter 4Managing Users and GroupsThis chapter explains how to manage users and groups on your Barracuda Web Filter. This chapter covers the followi

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Barracuda Web Filter Release 3.354 Chapter 4: Managing Users and GroupsOverviewThe Barracuda Web Filter distinguishes between two basic classes of the

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Administrator’s GuideCreating local users and groups 55Creating local users and groupsThis section describes how to create local accounts that you ca

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Barracuda Web Filter Release 3.356 Chapter 4: Managing Users and GroupsIntegrating with a user authentication serviceYou can integrate the Barracuda W

Strany 53 - Managing Users and Groups

Administrator’s GuideIntegrating with a user authentication service 57Communication between the LDAP domain controller servers and the Barracuda Web

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Barracuda Web Filter Release 3.358 Chapter 4: Managing Users and Groups1.A user logs into their domain and is authenticated by the domain controller.2

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Administrator’s GuideIntegrating with a user authentication service 59Enabling NTLM domain user authenticationIf your network uses an NT LAN Manager

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Barracuda Web Filter Release 3.36:Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

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Barracuda Web Filter Release 3.360 Chapter 4: Managing Users and GroupsTo enable NTLM user authenticationTo enable NTLM user authentication, go to the

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Administrator’s GuideViewing and managing accounts 61Viewing and managing accountsThe USERS/GROUPS > Account View page displays all the user accou

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Barracuda Web Filter Release 3.362 Chapter 4: Managing Users and Groups

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63Appendix AAbout the Barracuda Web Filter HardwareThis appendix provides hardware information for the Barracuda Web Filter. The following topics are

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Barracuda Web Filter Release 3.364 Appendix A: About the Barracuda Web Filter HardwareFront panel of the Barracuda Web FilterFigure A.1, Figure A.2, a

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Administrator’s GuideFront panel of the Barracuda Web Filter 65Barracuda Web Filter 610Figure A.2 shows the front components as described in Table A.

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Barracuda Web Filter Release 3.366 Appendix A: About the Barracuda Web Filter HardwareBarracuda Web Filter 810 and 910Figure A.3 shows the front compo

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Administrator’s GuideFront panel of the Barracuda Web Filter 6713 Hard Disk Drive #4 ActivityDisplays the activity for hard disk drive #414 WAN Port

Strany 65 - Barracuda Web Filter 610

Barracuda Web Filter Release 3.368 Appendix A: About the Barracuda Web Filter HardwareBack panel of the Barracuda Web FilterFigure A.4, Figure A.5, an

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Administrator’s GuideBack panel of the Barracuda Web Filter 69Barracuda Web Filter 610Figure A.5 shows the back components as described in Table A.5.

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7Chapter 1IntroductionThis chapter provides an overview of the Barracuda Web Filter and includes the following topics:• Overview on page 8• Deploying

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Barracuda Web Filter Release 3.370 Appendix A: About the Barracuda Web Filter HardwareTable A.6 describes the back components on the Barracuda Web Fil

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Administrator’s GuideHardware compliance 71Hardware complianceThis section contains compliance information for the Barracuda Web Filter hardware.Noti

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Barracuda Web Filter Release 3.372 Appendix A: About the Barracuda Web Filter Hardware

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73Appendix BRegular ExpressionsYou can use regular expressions in many of the Barracuda Web Filter features. Regular Expressions allow you to flexibly

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Barracuda Web Filter Release 3.374 Appendix B: Regular ExpressionsUsing special characters in expressionsThe following characters have a special meani

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75Appendix CLimited Warranty and LicenseLimited warrantyBarracuda Networks, Inc., or the Barracuda Networks, Inc. subsidiary or authorized Distributor

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Barracuda Web Filter Release 3.376 Appendix C: Limited Warranty and LicenseExclusions and restrictionsThis limited warranty does not apply to Barracud

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Administrator’s Guide 774. This License is effective until terminated. This License is automatically terminated without notice if you fail to comply

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Barracuda Web Filter Release 3.378 Appendix C: Limited Warranty and LicensePRODUCT FOR A FULL REFUND. YOUR RIGHT TO RETURN AND REFUND EXPIRES 30 DAYS

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Administrator’s Guide 79APPLICABLE FEE FOR THE UPGRADE; (2) USE OF UPGRADES IS LIMITED TO BARRACUDA NETWORKS EQUIPMENT FOR WHICH CUSTOMER IS THE ORIGI

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Barracuda Web Filter Release 3.38 Chapter 1: IntroductionOverviewThe Barracuda Web Filter is an integrated anti-spyware and content filtering solution

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Barracuda Web Filter Release 3.380 Appendix C: Limited Warranty and LicenseRestricted Rights. Barracuda Networks' commercial software and commerc

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Administrator’s Guide 81Open Source LicensingBarracuda products may include programs that are covered by the GNU General Public License (GPL) or other

Strany 81 - Open Source Licensing

Barracuda Web Filter Release 3.382 Appendix C: Limited Warranty and License0. This License applies to any program or other work which contains a notic

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Administrator’s Guide 833. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under th

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Barracuda Web Filter Release 3.384 Appendix C: Limited Warranty and LicenseIf any portion of this section is held invalid or unenforceable under any p

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Administrator’s Guide 85FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBI

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Barracuda Web Filter Release 3.386 Appendix C: Limited Warranty and LicenseBarracuda Products may contain programs that are copyright (c)1995-2005 Int

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Administrator’s Guide 87acknowledgment: "This product includes software developed by Computing Services at Carnegie Mellon University (http://www

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Barracuda Web Filter Release 3.388 Appendix C: Limited Warranty and Licensecontrol systems, and issue tracking systems that are managed by, or on beha

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Administrator’s Guide 896. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of t

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Administrator’s GuideOverview 9The Barracuda Web Filter scans inbound traffic for the following malware over HTTP port 80 and FTP port 21: spyware (s

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Barracuda Web Filter Release 3.390 Appendix C: Limited Warranty and Licensemedia, package the media, and mail the media. Please send a check payable

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91Aaccounts, creating 55Active mode 16, 25, 29administration interfacelogging in 21Administration page 34, 46, 49alerts, email 46Appearance page 34App

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Barracuda Web Filter Release 3.392HTTPS filtering option 41Iindicator lights 43infected clients list 46Infection Activity page 46inline pass-through d

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