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DNA: LAN Settings



This article describes how to configure up to four LANs on your Datto Networking Appliance (DNA).


  • Datto Networking Appliance (DNA)


The DNA contains 4 physical LAN ports that allow you to configure up to 4 individual LAN networks. These ports are labeled as 3, 4, 5 and 6 on the back of the DNA.

To manage your LANs, log into the DNA web interface, and click Networks, as shown in Figure 1.

Figure 1: Networks

You will see the LAN category displayed in the Networks column of the Manage page.

Figure 2: LAN category


Labeling LANs

1. Select the desired LAN from the Networks pane shown in Figure 2.

By default, the original LAN is named “Primary LAN”.  Remove this name from the text entry field, and enter a new name.

Figure 3: LAN default label

 3. Click the Save Changes button.

LAN Port Assignment and IP Subnet

By default, the DNA comes configured with all 4 LAN ports assigned to one LAN. To add additional LANs, you must first unassign a port from the main LAN. 

1. Select the desired LAN from the Networks pane shown in Figure 2.

2. In the Network Type section, select Native or Tagged VLAN

2. In the Port Assignment section, select which ports you would like included for the LAN.

3. In the IP Subnet section, provide the private router address and subnet mask you would like for the LAN. You may use up to a /30 subnet mask.

Figure 4: Port assignment settings

4. Click the Save Changes button.

IP Address Conflicts

In the event that a network interface is configured with an IP address in conflict with another network interface on the DNA, you will see an IP Address Conflict Detected banner displayed displayed across all pages of the device UI, as shown below. The Network Health card will also display the interface experiencing the conflict.

Figure 5: IP address conflict

Clicking the View button will take you to the affected interface's card, where you will see detailed information about the error.

Figure 6: Primary LAN card showing IP address conflict


1. Select the DHCP Pool option below the desired LAN in the Networks pane shown in Figure 2. A configuration field for the DHCP pool will appear, and allow you to specify the Start IP and End IP of the range of addresses for your appliance to hand out on the LAN.

Figure 7: DHCP Pool settings

2. When you are finished setting the DHCP pool's range, click Save Changes.

DHCP Relay

You can configure a DHCP server external to the DNA for more centralized management of client IP addresses. To activate this feature, select the DHCP Relay option below the desired LAN in the Networks pane shown in Figure 2.

DHCP Relay field will appear on the LAN card. Enter the IP address of the DHCP server you would like the DNA to use in the input box, and click Save Changes.

Figure 8: DHCP Relay

Static DHCP Leases (Reservations)

1. Select the Static DHCP Leases option below the desired LAN in the Networks pane shown in Figure 2.

2. A Static DHCP section will populate on the LAN's configuration card. Click the New Reservation button, and complete the MAC AddressDevice Name, and IP Address fields.

Valid hostnames must not contain any spaces or special characters. Hyphens are acceptable.

Figure 9: Static DHCP leases

3. Click the Save Changes button.

LAN Site-to-Site VPN access

If a Site-to-Site VPN exists on the DNA, you can allow this LAN to be accessed by Site-to-Site VPN by selecting the respective checkbox as seen in Figure 10.

Figure 10: LAN Site-to-Site VPN access

Quality of Service (QoS)

The Quality of Service option provides a method to create throttling and priority for specific traffic so that business-critical applications can work as expected, while throttling other non-critical applications.

Figure 11: Quality of Service

The Quality of Service option provides the following management features:

  • Max Bandwidth Per Client: Allows you to define universal upstream and downstream bandwidth limitations for all clients accessing the Datto Networking Appliance. This value represents the maximum amount of bandwidth that a client with no additional restrictions placed on it by the device will be allowed to use.
  • Traffic Shaping by Type: This field allows you to granularly throttle and prioritize network traffic based on its detected traffic type. The Datto Networking Appliance uses this filter list to classify traffic.
      • The Client BW Ceiling field allows you to define the maximum allowable percentage of available bandwidth each type of traffic is permitted to use.
      • The Priority dropdown allows you to prioritize bandwidth allocation to each type of network traffic. You can choose from HighNormal, or Low.
    Note that High-Priority network traffic will be prioritized above Normal-Priority and Low-Priority traffic, even if the High-Priority traffic has a Client BW Ceiling value of less than 100%.

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