Windows NLB keep toggling

Posted on 2012-08-15
Last Modified: 2012-08-16
hi there...
customer has windows NLB setup in hyper-v. found that the connection keep toggling between NLB node.
did try to remove the heartbeat, after this, when failover, the connection take sometimes to resume.

it is server 2008r2 VM, NBL in unicast..
Question by:hell_angel
    LVL 4

    Expert Comment

    by:Naushad shaikh
    server(vartual server) which are running on hyper-v if there are using Intel network card,kindly try with other network card  apart from Intel for heartbeat, if possible   try with genric Lan card.
    LVL 6

    Accepted Solution

    Are there any eventlogs to start with?

    Also i found this :

    Traffic alternates unexpectedly between the cluster hosts, and it breaks TCP connections.

    Cause: Unicast network addresses are causing issues with the switching hub. If you are using a switching hub to interconnect the cluster hosts, you must use NLB multicast support. Otherwise, the switch can behave erratically when the same unicast network is used on multiple switch ports.

    Solution: Check that you have selected multicast support in the Network Load Balancing Properties dialog box. If you do not want to use multicast support, you can interconnect the cluster hosts with a hub or coaxial cable instead of with a switch.


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