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  • Network Load Balancing

    Does anyone know what the heartbeat in the NBL actually sends. Im curious if it is just like a ping. If an IIS box is setup in NLB and the www services crash but the box is still up does the heartbeat pick that up? Does NLB stop sending info to that server till the services are restarted?

  • #2
    Re: Network Load Balancing

    If you use Multicast NLB you may need to to configure the network switch to support it.


    http://www.microsoft.com/technet/pro...ng/nlbfaq.mspx

    You can find the NLB port number;

    http://www.microsoft.com/technet/pro...1f8c04d97.mspx

    Regards,

    Yuval
    Best Regards,

    Yuval Sinay

    LinkedIn: https://www.linkedin.com/in/yuval14, Blog: http://blogs.microsoft.co.il/blogs/yuval14

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    • #3
      Re: Network Load Balancing

      this guy had the answer i was looking for:

      from http://www.west-wind.com/presentatio...indows2003.asp

      "In another test I decided to turn off the Web service, which resulted expectedly in the network connection still being fed requests that now started to fail. This is to be expected because NLB deals at the network protocol level but doesn’t check for failure of the requests at the network application level (Web Server). For this scenario you will need a smart monitoring application that can tell that your Web services are not responding on port 80 or even better not returning the results that you should be getting back."

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      • #4
        Re: Network Load Balancing

        Originally posted by thenewnoise
        this guy had the answer i was looking for:

        from http://www.west-wind.com/presentatio...indows2003.asp

        "In another test I decided to turn off the Web service, which resulted expectedly in the network connection still being fed requests that now started to fail. This is to be expected because NLB deals at the network protocol level but doesn’t check for failure of the requests at the network application level (Web Server). For this scenario you will need a smart monitoring application that can tell that your Web services are not responding on port 80 or even better not returning the results that you should be getting back."
        If you know linux give this a try:

        http://www.nagios.org/

        Nagios can monitor ports and it's free
        Michael Armstrong
        www.m80arm.co.uk
        MCITP: EA, MCTS, MCSE 2003, MCSA 2003: Messaging, CCA, VCP 3.5, 4, 5, VCAP5-DCD, VCAP5-DCA, ITIL, MCP, PGP Certified Technician

        ** Remember to give credit where credit is due and leave reputation points sigpic where appropriate **

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