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Home > Success Center > IP Address Manager (IPAM) > IPAM - Knowledgebase Articles > Empty MAC from Neighbor Scans causes IPs to be flagged as Used

Empty MAC from Neighbor Scans causes IPs to be flagged as Used

Updated December 14, 2016

Overview

This article pertains to an issue that can happen where IPs that are not in use are being flagged as Used when a Neighbor Scan on the subnet finds an IP entry in the ARP cache of the scanned device that has an empty MAC or 00-00-00-00-00-00.

Environment

IPAM 4.3.2 and lower: Resolved below

IPAM 4.6 and higher: Resolved below

Cause 

This issue is caused when IPAM mistakenly takes the empty MAC as a true MAC and considering the IP entry in the cache to be in use. 

Resolution

If you are on IPAM 4.3.2 or lower, follow these steps:

  1. Upgrade to IPAM 4.3.2.
  2. Stop all Orion services through the Orion Service Manager.
  3. On the IPAM server, navigate to Program Files (x86)\SolarWinds\Orion\IPAM.
  4. Find and edit the file named SolarWinds.IPAM.Jobs.dll.config.
  5. Search for the line like so
    <add key="NeigborScanJob.SkipEmptyMAC" value="False" />
  6. Change the value from False to True.
  7. Save the file.
  8. Restart the services.
  9. This will cause IPAM to automatically skip all IPs in the arp cache that has an empty MAC.

 

For IPAM 4.6 and higher, the setting above has been migrated to the centralized settings within Orion. Please follow these steps:

  1. Install IPAM 4.6 HotFix 2
  2. Once completed, access the Centralized Settings feature by adding the following to the URL:
  3. http://<OrionServer>/Orion/Admin/AdvancedConfiguration/Global.aspx
    For example: http:/<server_name>:8787/Orion/Admin/AdvancedConfiguration/Global.aspx
  4. Choose the Global tab to apply the setting to all servers, or select a specific server.
  5. Search for IPAM and check the box for SkipEmptyMAC
  6. Click Save.
  7. Restart the Orion services.
  8. This will cause IPAM to automatically skip all IPs in the arp cache that has an empty MAC.

 

 

 

 

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