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The Mapper I/O network protocol (LLTDIO) driver must be disabled.


Overview

Finding ID Version Rule ID IA Controls Severity
V-15696 WN12-CC-000001 SV-53072r1_rule Medium
Description
The Mapper I/O network protocol (LLTDIO) driver allows the discovery of the connected network and allows various options to be enabled. Disabling this helps protect the system from potentially discovering and connecting to unauthorized devices.
STIG Date
Windows Server 2012 / 2012 R2 Domain Controller Security Technical Implementation Guide 2016-12-19

Details

Check Text ( C-47378r2_chk )
If the following registry values do not exist or are not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \Software\Policies\Microsoft\Windows\LLTD\

Value Name: AllowLLTDIOOndomain
Value Name: AllowLLTDIOOnPublicNet
Value Name: EnableLLTDIO
Value Name: ProhibitLLTDIOOnPrivateNet

Type: REG_DWORD
Value: 0
Fix Text (F-45998r1_fix)
Configure the policy value for Computer Configuration -> Administrative Templates -> Network -> Link-Layer Topology Discovery -> "Turn on Mapper I/O (LLTDIO) driver" to "Disabled".