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Preferred Network Rule for Hyper-V Host Not Using IP Specified

KB ID: 3140
Product: Veeam Backup & Replication | 9.5 | 10 | 11 | 12 | 12.1 | 12.2 | 12.3 | 12.3.1
Published: 2020-04-06
Last Modified: 2024-10-29
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Challenge

Backup network traffic does not use the NICs associated with  IPs configured within the preferred network rules for a Microsoft Hyper-V Host.

Cause

This can occur because, by default, Veeam Backup & Replication stores only the IP addresses for Hyper-V hosts that DNS provides.

Solution

To configure Veeam Backup & Replication to collect the IP addresses of all NICs on the Microsoft Hyper-V server(s), create the following registry value on the Veeam Backup Server:

Key Location: HKLM\SOFTWARE\Veeam\Veeam Backup and Replication\
Value Name: HvCollectAllHostAddresses
Value Type: DWORD (32-Bit) Value
Value Data: 1

After this registry value is created on the Veeam Backup Server, rescan the Hyper-V Hosts to update the recorded IP addresses for the rescanned host.

New-ItemProperty -Path 'HKLM:\SOFTWARE\Veeam\Veeam Backup and Replication\' -Name 'HvCollectAllHostAddresses' -Value "1" -PropertyType DWORD -Force
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