SIRIS, ALTO, and NAS: Device Auxiliary NIC Settings / Backing up over a Secondary NIC



Device Auxiliary NIC Settings / Backing up over a Secondary NIC


  • Datto SIRIS


This article shows you how and why to use the auxiliary NICs of a Datto device. For more information about device networking requirements, see the article Datto Networking Requirements. To learn more about the networking user interface, see the article Network Configuration User Interface.

Accessing Networking

To configure a Datto device's networking status, click on the Configure tab in the device GUI, Then, select Networking from the drop-down menu.

Figure 1: The Datto device GUI (click to enlarge)

Auxiliary NICs

Auxiliary NICs are used for the following operations:

  • NIC bonding
  • Protecting of machines on a separate subnet with no route in place
  • Separate NIC for a virtual machine hosted on the Datto appliance
  • Allowing the device to use the primary NIC to check in and perform offsite operations, while performing local backup operations over the secondary NIC

Best practices for auxiliary NICs on Datto SIRIS devices:

  • Connect only the NICs intended for active use.
  • Do not enable NICs without a network connected; enabling and configuring unconnected auxiliary NICs may cause networking issues.
Hyper-V virtualizations cannot use the auxiliary NIC for their offload method; they must use the primary NIC. 

NIC Bonding

  1. In the Datto device GUI's Network Settings screen, select the two NICs to be bonded and click Apply Bond Settings.

Figure 2: Bonded Interfaces settings (click to enlarge)

Protecting machines on a separate subnet

If a Datto device needs to communicate across multiple subnets to protect various machines, you can configure it to do so with the use of the auxiliary NICs as long as the subnet of the systems you are backing up are on the same the subnet as the eth port you plan to use.
  1. Plug in a live network cable from the other subnet into one of the auxiliary NICs on the Datto device.
  2. In the Datto device UI's Network screen, configure the auxiliary NIC's networking information.
fig1.PNGFigure 3: IP settings for primary and secondary NICs (click to enlarge)

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