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Maximum transfer unit (MTU) reported by the adapter is too small to contain an NLB heartbeat message

Microsoft.Windows.NetworkLoadBalancing.6.2.Maximum.transfer.unit.reported.by.the.adapter.is.too.small.to.contain.an.NLB.heartbeat.message (Rule)

Knowledge Base article:

Summary

The network adapter to which Network Load Balancing (NLB) is bound must be properly configured and capable of performing NLB operations. If the adapter is not properly configured, the NLB driver may fail to bind to the adapter.

Resolutions

Ensure that the MTU is properly configured

Ensure that the Maximum Transfer Unit (MTU) on the network adapters on all hosts in the Network Load Balancing (NLB) cluster is set to the default value or bind NLB to an adapter that supports a larger MTU.

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.Maximum.transfer.unit.reported.by.the.adapter.is.too.small.to.contain.an.NLB.heartbeat.message" 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>90</Value>

          </ValueExpression>

        </SimpleExpression>

      </Criteria>

    </DataSource>

  </DataSources>

  <WriteActions>

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

      <Priority>1</Priority>

      <Severity>2</Severity>

      <AlertMessageId>$MPElement[Name="Microsoft.Windows.NetworkLoadBalancing.6.2.Maximum.transfer.unit.reported.by.the.adapter.is.too.small.to.contain.an.NLB.heartbeat.message.AlertMessage"]$</AlertMessageId>

      <EnableAlert>true</EnableAlert>

    </WriteAction>

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

      <CollectEvent>false</CollectEvent>

    </WriteAction>

  </WriteActions>

</Rule>