Barracuda Networks Load Balancer Spezifikationen

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

38 Barracuda Link Balancer Administrator’s Guide

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

vi Barracuda Link Balancer Administrator’s Guide

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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