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NLB on two Front ends

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  • NLB on two Front ends

    Hi all

    I've been reading this article:

    http://www.petri.com/load_balancing_...nd_servers.htm

    It is not clear where the second NIC plugs in. It is into the same subnet of the first nic or does it plug into the other front end?
    Server 2000 MCP
    Development: ASP, ASP.Net, PHP, VB, VB.Net, MySQL, MSSQL - Check out my blog http://tonyyeb.blogspot.com

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  • #2
    Re: NLB on two Front ends

    I have configured NLB quite a few times using only a single NIC on each server. I think you can configure it to use a second NIC, but in that case the second NIC goes on a separate subnet.

    Jim McBee, Exchange MVP
    Blog - http://mostlyexchange.blogspot.com

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    • #3
      Re: NLB on two Front ends

      Originally posted by tonyyeb
      It is not clear where the second NIC plugs in. It is into the same subnet of the first nic or does it plug into the other front end?
      To answer your question it plugs in to the same network.

      There are two modes for NLB, unicast and multicast.
      Unicast is where the MAC address of the NIC is replaced with the cluster MAC address. This MAC address is used for responding to both the cluster IP and the server's IP. This means that the nodes in the cluster can't communicate with each other. This is one of the reasons for a second NIC.
      Multicast is where the server has two MAC addresses for the one NIC. One MAC address is the cluster MAC address and the other is the NIC's MAC address. It will use cluster address for NLB traffic and the NIC address for all other traffic. This mode, however, requires that the router be compatible with multicast MAC addresses.

      You can have a mix of servers with two NICs and servers with one but they all have to be unicast or all multicast.

      Having two NIC is for separating NLB traffic from other traffic and/or enabling communication between nodes.

      One thing to note is that if you are running in unicast mode, the Network Load Balancing Manager needs to be running on either a node with two NICs or a computer outside the cluster.
      Regards,
      Jeremy

      Network Consultant/Engineer
      Baltimore - Washington area and beyond
      www.gma-cpa.com

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