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  • NLB Cluster configuration for Exchange 2007 CAS\Hub role

    Hello all !

    According to http://kb.vmware.com/selfservice/mic...xternalId=1556 Microsoft NLB is not working properly in Unicast Mode.
    Problem is that the organization I manage is configured in Unicast Mode. How do you think that changing to Multicast mode will affect it ?

    I'm running Windows Server 2008 and Exchange 2007.

    If more details are needed, please aks.

    Thanks in advance !

  • #2
    Re: NLB Cluster configuration for Exchange 2007 CAS\Hub role

    Hmmm this would be more an VMware issue then Exchange.
    But note, for NLB Multicast you also need to configure static ARP and static MAC address entries in the switches.
    Marcel
    Technical Consultant
    Netherlands
    http://www.phetios.com
    http://blog.nessus.nl

    MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
    "No matter how secure, there is always the human factor."

    "Enjoy life today, tomorrow may never come."
    "If you're going through hell, keep going. ~Winston Churchill"

    Comment


    • #3
      Re: NLB Cluster configuration for Exchange 2007 CAS\Hub role

      Maybe the KB can help you out as well

      http://kb.vmware.com/selfservice/mic...rnalId=1006778
      Maish
      ----------------------------------------------------------
      Technodrone|@maishsk|Author of VMware vSphere Design
      VMware vExpert 2013-2010,VCAP5-DCA/DCD,VCP
      MSCA 2000/2003, MCSE 2000/2003
      A proud husband and father of 3 girls
      ----------------------------------------------------------
      If you find the information useful please don't forget to give reputation points sigpic.

      Have a good one!!

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      • #4
        Re: NLB Cluster configuration for Exchange 2007 CAS\Hub role

        But watch out with NLB unicast. Because of the nature of MS NLB (unicast) the switches are not able to learn the Virtual mac address. Therefor all traffic for that cluster will be flooded on all ports within it's VLAN. This can become a serious issue with network performance.
        Marcel
        Technical Consultant
        Netherlands
        http://www.phetios.com
        http://blog.nessus.nl

        MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
        "No matter how secure, there is always the human factor."

        "Enjoy life today, tomorrow may never come."
        "If you're going through hell, keep going. ~Winston Churchill"

        Comment


        • #5
          Re: NLB Cluster configuration for Exchange 2007 CAS\Hub role

          For years I've never been a fan of NLB. Too many caveats. Good for small business though I suppose.
          VCDX3 #34, VCDX4, VCDX5, VCAP4-DCA #14, VCAP4-DCD #35, VCAP5-DCD, VCPx4, vEXPERTx4, MCSEx3, MCSAx2, MCP, CCAx2, A+
          boche.net - VMware Virtualization Evangelist
          My advice has no warranties. Follow at your own risk.

          Comment


          • #6
            Re: NLB Cluster configuration for Exchange 2007 CAS\Hub role

            NLB can work perfectly when it's designed well. However Microsoft didn't follow the RFC standards where it causes issues with switches. Also with multicast NLB there problems. Configuring static ARP and static MAC addresses is the method to resolve it but what if the VM is moved from one ESX host to an other...?
            Marcel
            Technical Consultant
            Netherlands
            http://www.phetios.com
            http://blog.nessus.nl

            MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
            "No matter how secure, there is always the human factor."

            "Enjoy life today, tomorrow may never come."
            "If you're going through hell, keep going. ~Winston Churchill"

            Comment


            • #7
              Re: NLB Cluster configuration for Exchange 2007 CAS\Hub role

              I can hate it and you can't stop me.
              VCDX3 #34, VCDX4, VCDX5, VCAP4-DCA #14, VCAP4-DCD #35, VCAP5-DCD, VCPx4, vEXPERTx4, MCSEx3, MCSAx2, MCP, CCAx2, A+
              boche.net - VMware Virtualization Evangelist
              My advice has no warranties. Follow at your own risk.

              Comment


              • #8
                Re: NLB Cluster configuration for Exchange 2007 CAS\Hub role

                Originally posted by jasonboche View Post
                For years I've never been a fan of NLB. Too many caveats. Good for small business though I suppose.
                To Jason's point MS NLB is not an ideal solution, but for an SMB it does the trick. But it is some what of a hassle setting up and as Dumber mentioned you have to add static ARP entries into your switches. For both of those reason that is why we have begun testing the Citrix VPX Express edition. This is a free version of the Netscaler load balancer product that runs in a VM. It does have a few limitiations (for being free of course) but for are small shop it provides another alternative.

                -Jaosn
                MCSA/MCSE 2K3,MCITP:ESA,MCTS x 4,VCP x 2

                Comment


                • #9
                  Re: NLB Cluster configuration for Exchange 2007 CAS\Hub role

                  NLB works perfectly in enterprise environments but not really in a Virtual Environment...
                  Marcel
                  Technical Consultant
                  Netherlands
                  http://www.phetios.com
                  http://blog.nessus.nl

                  MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
                  "No matter how secure, there is always the human factor."

                  "Enjoy life today, tomorrow may never come."
                  "If you're going through hell, keep going. ~Winston Churchill"

                  Comment

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