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NLB detected an unequal number of virtual IP (VIP) addresses and network masks

Microsoft.Windows.NetworkLoadBalancing.6.2.NLB.detected.an.unequal.number.of.virtual.IP.addresses.and.network.masks (Rule)

Knowledge Base article:

Summary

Hosts in a Network Load Balancing (NLB) cluster are configured to load balance network traffic. Host configuration is set by using NLB Manager, and if it is not configured properly, the NLB cluster may not function correctly.

Resolutions

Ensure a consistent number of virtual IP addresses and subnet masks

On all Network Load Balancing (NLB) cluster hosts, the virtual IP addresses must have an equal number of subnet masks specified.

To ensure that the number of virtual IP addresses is the same as the number of subnet masks:

Element properties:

TargetMicrosoft.Windows.NetworkLoadBalancing.6.2.ServerRole
CategoryAlert
EnabledTrue
Alert GenerateFalse
RemotableTrue

Member Modules:

ID Module Type TypeId RunAs 
DS DataSource Microsoft.Windows.NetworkLoadBalancing.EventProvider Default
WA WriteAction Microsoft.Windows.NetworkLoadBalancing.6.2.GenerateAlert.SuppressByDescription Default
WriteToDB WriteAction Microsoft.Windows.NetworkLoadBalancing.6.2.CollectEvent Default

Source Code:

<Rule ID="Microsoft.Windows.NetworkLoadBalancing.6.2.NLB.detected.an.unequal.number.of.virtual.IP.addresses.and.network.masks" Enabled="onEssentialMonitoring" Target="Microsoft.Windows.NetworkLoadBalancing.6.2.ServerRole" ConfirmDelivery="true" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>Alert</Category>

  <DataSources>

    <DataSource ID="DS" TypeID="NLBLibrary!Microsoft.Windows.NetworkLoadBalancing.EventProvider">

      <Criteria>

        <SimpleExpression>

          <ValueExpression>

            <XPathQuery>EventDisplayNumber</XPathQuery>

          </ValueExpression>

          <Operator>Equal</Operator>

          <ValueExpression>

            <Value>110</Value>

          </ValueExpression>

        </SimpleExpression>

      </Criteria>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="WA" TypeID="Microsoft.Windows.NetworkLoadBalancing.6.2.GenerateAlert.SuppressByDescription">

      <Priority>1</Priority>

      <Severity>1</Severity>

      <AlertMessageId>$MPElement[Name="Microsoft.Windows.NetworkLoadBalancing.6.2.NLB.detected.an.unequal.number.of.virtual.IP.addresses.and.network.masks.AlertMessage"]$</AlertMessageId>

      <EnableAlert>true</EnableAlert>

    </WriteAction>

    <WriteAction ID="WriteToDB" TypeID="Microsoft.Windows.NetworkLoadBalancing.6.2.CollectEvent">

      <CollectEvent>false</CollectEvent>

    </WriteAction>

  </WriteActions>

</Rule>