TMG Server detected network elements that contain overlapping address ranges

Microsoft.Forefront.TMG.ISA_Server_detected_network_elements_that_contain_overlapping_address_ranges.Rule (Rule)

This Rule generates alerts when TMG Server detected network elements that contain overlapping address ranges

Knowledge Base article:

Summary

TMG Server detected that networks contain overlapping address ranges.

Causes

An IP address can be included only in one network.

Resolutions

Modify the networks so that the IP addresses included in one network are not included in any other networks.

Element properties:

Target	Microsoft.Forefront.TMG.Server
Category	EventCollection
Enabled	True
Alert Generate	False
Remotable	True

Member Modules:

ID	Module Type	TypeId	RunAs
DS	DataSource	Microsoft.Forefront.TMG.Rule.AlertGenerate.DS	Default
WA	WriteAction	Microsoft.Forefront.TMG.Rule.AlertGenerate.WA	Default

Source Code:

<Rule ID="Microsoft.Forefront.TMG.ISA_Server_detected_network_elements_that_contain_overlapping_address_ranges.Rule" Enabled="true" Target="Microsoft.Forefront.TMG.Server" ConfirmDelivery="true" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>EventCollection</Category>

  <DataSources>

    <DataSource ID="DS" TypeID="Microsoft.Forefront.TMG.Rule.AlertGenerate.DS">

      <ComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</ComputerName>

      <LogName>Application</LogName>

      <EventsPattern>^(21097)$</EventsPattern>

      <EventType>1</EventType>

      <SourcePattern>Microsoft Forefront TMG Firewall</SourcePattern>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="WA" TypeID="Microsoft.Forefront.TMG.Rule.AlertGenerate.WA">

      <AlertMessageId>$MPElement[Name="Microsoft.Forefront.TMG.ISA_Server_detected_network_elements_that_contain_overlapping_address_ranges.AlertMessage"]$</AlertMessageId>

      <DomainName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/DomainDnsName$</DomainName>

      <Priority>2</Priority>

      <Severity>2</Severity>

    </WriteAction>

  </WriteActions>

</Rule>