OPNsense add interface

OPNsense has two network interfaces (LAN and WAN) after a standard installation. In this article, we will show you how to add another network interface. This is required, for example, for a DMZ or in an HA cluster setup for connection state synchronization (pfSync).

Add network interface

The following screenshots of OPNsense 19.7 show how to add a network interface. In this example a LES compact 4L is used:

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  Select the desired network interface under Interfaces ‣ Assignment in the area New interface.

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  Click on the + symbol.

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  Click on OPT1.

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  Click on Enable Interface.

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  The possible configuration fields appear.

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  Customize Description (here PFSYNC), IPv4 Configuration Type (here Static IPv4), and the desired IP configuration.

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  Click on Apply changes.

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  Under 'Firewall ‣ Rules ‣ PFSYNC you can now configure firewall rules.

Author: Werner Fischer Werner Fischer, working in the Knowledge Transfer team at Thomas-Krenn, completed his studies of Computer and Media Security at FH Hagenberg in Austria. He is a regular speaker at many conferences like LinuxTag, OSMC, OSDC, LinuxCon, and author for various IT magazines. In his spare time he enjoys playing the piano and training for a good result at the annual Linz marathon relay.