Barracuda Networks Load Balancer Specifikace

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RECLAIM YOUR NETWORK™
Administrators Guide
Barracuda Link Balancer
Barracuda Networks Technical Documentation
Version 2.2
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Strany 1 - Barracuda Link Balancer

RECLAIM YOUR NETWORK™Administrator’s GuideBarracuda Link BalancerBarracuda Networks Technical DocumentationVersion 2.2

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4 Barracuda Link Balancer Administrator’s GuideVLAN SupportThe Barracuda Link Balancer supports Layer 2 VLANs.High AvailabilityThe Barracuda Link

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Chapter 1: Introduction 5Site-to-Site VPN and Link FailoverYou can create a site-to-site VPN tunnel between two Barracuda Link Balancers or betw

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6 Barracuda Link Balancer Administrator’s GuideLocal Network ServicesThe Barracuda Link Balancer includes the following local network services:•

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Chapter 2: Installing the Barracuda Link Balancer 7Chapter 2Installing the Barracuda Link BalancerThis chapter provides instructions for install

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8 Barracuda Link Balancer Administrator’s Guide In Front of Firewall Figure 2.1 gives an example of a customer network that has both client and

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Chapter 2: Installing the Barracuda Link Balancer 9• The Barracuda Link Balancer LAN IP address can be any internal or public address that is r

Strany 8 - About this Guide

10 Barracuda Link Balancer Administrator’s Guide Figure 2.4 shows the example network with a Barracuda Link Balancer installed and acting as a fi

Strany 9 - Outbound Link Load Balancing

Chapter 2: Installing the Barracuda Link Balancer 11In Front of Your Firewall Installation These detailed instructions describe how to deploy th

Strany 10 - Traditional Firewall

12 Barracuda Link Balancer Administrator’s GuideFigure 2.5: Front panel of a Barracuda Link Balancer with LAN portOtherwise, connect an Ethernet

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Chapter 2: Installing the Barracuda Link Balancer 13Link Balancer, do not power off during an update or download. To view the progress of the do

Strany 12 - Technical Support

Copyright NoticeCopyright 2004-2011, Barracuda Networkswww.barracuda.comv2.2-110503-01-0503All rights reserved. Use of this product and this manual is

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14 Barracuda Link Balancer Administrator’s GuideIP address. If the latter, it should be on a different subnet than the LAN devices already on the

Strany 14 - In Front of Firewall

Chapter 2: Installing the Barracuda Link Balancer 15You do not need to update your existing firewall configuration unless you want to make it aw

Strany 15 - Replacing Your Firewall

16 Barracuda Link Balancer Administrator’s GuideFigure 2.7: Front panel of a Barracuda Link Balancer with LAN portOtherwise, connect an Ethernet

Strany 16 - Table 2.2: Installation Steps

Chapter 2: Installing the Barracuda Link Balancer 17Link Balancer, do not power off during an update or download. To view the progress of the do

Strany 17 - Settings

18 Barracuda Link Balancer Administrator’s GuideStep 7: Install in the Production NetworkNow that the Barracuda Link Balancer is configured, inst

Strany 18 - Step 3: Update Firmware

Chapter 3: Configuring the Barracuda Link Balancer 19Chapter 3Configuring the Barracuda Link BalancerThis chapter describes the configuration ta

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20 Barracuda Link Balancer Administrator’s GuideNew WAN links that are configured correctly are automatically used for outbound link balancing. F

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Chapter 3: Configuring the Barracuda Link Balancer 21Creating IP AliasesYou can create virtual interfaces or IP aliases by associating an IP add

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22 Barracuda Link Balancer Administrator’s GuideFirewall FunctionalityUsing 1:1 NAT and port forwarding rules, the Barracuda Link Balancer can pe

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Chapter 3: Configuring the Barracuda Link Balancer 23If the Barracuda Link Balancer firewall is disabled, you can create a NAT rule to map the d

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Chapter 2: iiiContentsChapter 1 – Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 1Overview . . . . . . . . . . .

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24 Barracuda Link Balancer Administrator’s GuideCreating Custom ApplicationsUse the Policy > Applications page to view and define applications

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Chapter 3: Configuring the Barracuda Link Balancer 25If you want to employ default link balancing policy, where the link with the greatest avail

Strany 26 - Configuring VLANs

26 Barracuda Link Balancer Administrator’s GuideSpecifying the Link Used by Outgoing Traffic... 26Changing the So

Strany 27 - Configuring the Firewall

Chapter 3: Configuring the Barracuda Link Balancer 27originating from those addresses can go out without being NAT'ed. Depending on how the

Strany 28 - Inbound 1:1 NAT Rules

28 Barracuda Link Balancer Administrator’s GuideFigure 3.1: Site-to-Site VPN The Services > VPN page displays all tunnels and their status. Yo

Strany 29 - Firewall Logging

Chapter 3: Configuring the Barracuda Link Balancer 29Failover and FailbackWhen configuring a tunnel you can specify a primary and a backup link.

Strany 30 - Managing Bandwidth

30 Barracuda Link Balancer Administrator’s Guide• Use the tools on the Advanced > Troubleshooting page, ping the remote gateway and perform ot

Strany 31 - Outbound Traffic Routing

Chapter 3: Configuring the Barracuda Link Balancer 31disrupted. A short TTL value for this record ensures that the cached address for the failed

Strany 32 - VPN and Email Rules

32 Barracuda Link Balancer Administrator’s GuideStep 1 - Enable Authoritative DNS on the Barracuda Link BalancerGo to the Services > Authorita

Strany 33 - Site-to-Site VPN Tunnels

Chapter 3: Configuring the Barracuda Link Balancer 33Step 3 - Set up DNS for Internal ClientsIf you have an internal DNS server, configure it to

Strany 34 - Creating VPN Tunnels

iv Barracuda Link Balancer Administrator’s GuidePort Forwarding Rules . . . . . . . . . . . . . . . . . . . . . . . . .

Strany 35 - Troubleshooting a VPN Tunnel

34 Barracuda Link Balancer Administrator’s Guide my IN NS ns1 my IN NS ns2 ns1 IN A 216.101.

Strany 36 - DNS Records Time to Live

Chapter 3: Configuring the Barracuda Link Balancer 35DNS RecordsDNS Records Generated when Creating a Domain When you create a domain on the Bar

Strany 37 - DNS Zone Transfer Blocking

36 Barracuda Link Balancer Administrator’s GuideSetting Email Addresses for Alerts ... 36Customi

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Chapter 3: Configuring the Barracuda Link Balancer 37It is important that the time zone is set correctly because this information is used to coo

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38 Barracuda Link Balancer Administrator’s Guide

Strany 40 - Zones and Domains

Chapter 4: Creating a High Availability Environment 39Chapter 4Creating a High Availability EnvironmentThis chapter describes how to create a hi

Strany 41 - DNS Records

40 Barracuda Link Balancer Administrator’s GuideClustered Barracuda Link Balancers communicate according to the Virtual Router Redundancy Protoco

Strany 42 - Changing the Default Password

Chapter 4: Creating a High Availability Environment 41• Be activated and on the same version of firmware. The High Availability capability is on

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42 Barracuda Link Balancer Administrator’s GuidePlanning Your High Availability DeploymentExtra equipment may be needed to support the clustered

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Chapter 4: Creating a High Availability Environment 43 In Front of Dual Network FirewallsFigure 4.4 shows two Barracuda Link Balancers and two c

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Chapter 2: vChapter 5 – Monitoring the System . . . . . . . . . . . . . . . . . . 47Checking Status . . . . . . . . . . . . . .

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44 Barracuda Link Balancer Administrator’s GuideNo External Firewalls Figure 4.5 shows two Barracuda Link Balancers with the firewall enabled. As

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Chapter 4: Creating a High Availability Environment 45Step 1: Complete Installation Process for Both SystemsTo prepare the Barracuda Link Balanc

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46 Barracuda Link Balancer Administrator’s GuideStep 4: Put in ProductionFrom now on, always use the VRRP virtual IP address to manage the Barrac

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Chapter 5: Monitoring the System 47Chapter 5Monitoring the SystemThis chapter describes the tasks you can do to check on the performance of the

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48 Barracuda Link Balancer Administrator’s GuideIf the Barracuda Link Balancer firewall is enabled, you can view the firewall log on the Logs >

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Chapter 5: Monitoring the System 49SNMP TrapsAn SNMP trap is generated by the Barracuda Link Balancer SNMP agent every five minutes if one of th

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50 Barracuda Link Balancer Administrator’s GuideThe Report Options section allows you to choose the criteria for compiling the report data, as we

Strany 53 - Monitoring the System

Chapter 6: Maintaining the Barracuda Link Balancer 51Chapter 6Maintaining the Barracuda Link BalancerThis chapter describes how to maintain the

Strany 54 - SNMP Monitoring

52 Barracuda Link Balancer Administrator’s GuideIn the event that a Barracuda Link Balancer fails and you cannot resolve the issue, customers tha

Strany 55 - System Reports

Chapter 6: Maintaining the Barracuda Link Balancer 53Using the Built-in Troubleshooting ToolsThe Advanced > Troubleshooting page provides var

Strany 56 - Viewing System Tasks

vi Barracuda Link Balancer Administrator’s Guide

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54 Barracuda Link Balancer Administrator’s GuideReboot OptionsTable 6.1 describes the options available at the reboot menu.Table 6.1: Reboot Opti

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Chapter 7: 55Appendix ALimited Warranty and LicenseBarracuda Networks Limited Hardware Warranty (v 2.1)Barracuda Networks, Inc., or the Barracu

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56 Barracuda Link Balancer Administrator’s Guidemaintained in accordance with instructions supplied by Barracuda Networks, or (f) subjected to ab

Strany 60 - Reboot Options

Chapter 7: 57network where it could be utilized by multiple devices or copied. Unless otherwise expressly provided in the documentation, your u

Strany 61 - Limited Warranty and License

58 Barracuda Link Balancer Administrator’s GuideWERE CAUSED BY IMPROPER OPERATION, USE OF UNSUITABLE RESOURCES, ABNORMAL OPERATING CONDITIONS (IN

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Chapter 7: 5910. Trademarks. Certain portions of the product and names used in this Agreement, the Software and the documentation may constitut

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60 Barracuda Link Balancer Administrator’s Guide16. Subscriptions. Software updates and subscription information provided by Barracuda Energize

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Chapter 7: 6159 Temple Place, Suite 330, Boston, MA 02111-1307 USAEveryone is permitted to copy and distribute verbatim copies of this license

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62 Barracuda Link Balancer Administrator’s Guideis covered only if its contents constitute a work based on the Program (independent of having bee

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Chapter 7: 63c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This alternative is al

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Chapter 1: Introduction 1Chapter 1IntroductionThis chapter provides an overview of the Barracuda Link Balancer and includes the following topics

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64 Barracuda Link Balancer Administrator’s GuideThis section is intended to make thoroughly clear what is believed to be a consequence of the res

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Chapter 7: 65Software and that both the above copyright notice(s) and this permission notice appear in supporting documentation." Barracud

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66 Barracuda Link Balancer Administrator’s GuideNEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE

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Chapter 7: 67purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in

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68 Barracuda Link Balancer Administrator’s Guide6. Trademarks. This License does not grant permission to use the trade names, trademarks, service

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Index - 69IndexNumerics1:1 NAT 4, 22Aadditional IP addressesin front of your firewall 13replacing your firewall 17Administration page 36, 48, 52alerts

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70 - IndexStatus page 47system alerts email address 49TTask Manager page 50technical support, contacting 6testing memory 54time zone, setting 36Troubl

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2 Barracuda Link Balancer Administrator’s GuideFigure 1.1: Barracuda Link Balancer FunctionalityAbout this GuideThis guide provides a general dis

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Chapter 1: Introduction 3Link ManagementThe Barracuda Link Balancer can manage links that have static or dynamic (DHCP) IP addresses and can aut

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