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How can I configure Sub-Interfaces?
10/14/2021 
593 People found this article helpful
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Description
The following article explains how to configure Virtual Sub-Interfaces on the SonicWall appliances.
In this scenario, we have a data network on the Primary LAN(X0 interface) and a VoIP network on the Virtual LAN with a VLAN tag of 100. The interface assigned to the VLAN will be X0:V100.
Resolution
Resolution for SonicOS 7.X
This release includes significant user interface changes and many new features that are different from the SonicOS 6.5 and earlier firmware. The below resolution is for customers using SonicOS 7.X firmware.
- Select a Parent Interface and Create a Sub-Interface with a VLAN ID, click MANAGE , navigate to Network | Interfaces.
- In the Select Interface drop-down option, select Virtual Interface, you will get a pop-up window to configure the sub-interface.
- Select the Zone as LAN (you can create a custom zone for the network if required).
- Set the VLAN tag to 100 (The VLAN ID can be set as per your network requirement).
- Parent interface : X0
- Set the Mode/IP Assignment to Static IP Mode.
- Set an IP address for the network. (This will be the gateway IP for the network).
- Comment and enable the management on the sub-interface if required.
- Click on OK to save the settings.Once the settings are saved, you will see two networks configured on the X0 interface.
Resolution for SonicOS 6.2 and Below
The below resolution is for customers using SonicOS 6.2 and earlier firmware. For firewalls that are generation 6 and newer we suggest to upgrade to the latest general release of SonicOS 6.5 firmware.
- Select a Parent Interface and Create a Sub-Interface with a VLAN ID, navigate to Network | Interfaces.
- In the Select Interface drop-down option, select Virtual Interface, you will get a pop-up window to configure the sub-interface.
- Select the Zone as LAN (you can create a custom zone for the network if required).
- Set the VLAN tag to 100 (The VLAN ID can be set as per your network requirement).
- Parent interface : X0.
Configure the required network for the sub-interface
- Set the Mode/IP Assignment to Static IP Mode.
- Set an IP address for the network. (This will be the gateway IP for the network).
- Comment and enable the management on the sub-interface if required.
- Click OK .Once the settings are saved, you will see two networks configured on the X0 interface.
NOTE:It is best practice when configuring a sub-interface to ensure that the parent interface has an assigned IP address, regardless of whether this will be used within your environment. Configuring a sub-interface to a parent interface that is unassigned is not recommended.
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