Low Energy Systems (LES) Firewall Server

For the operation of an Open Source Firewall such as OPNsense, a large number of different server systems is suitable. In this article, we present Low Energy Systeme (LES) that we have tested with OPNsense at Thomas-Krenn.

To our OPNsense firewalls in the online shop of Thomas-Krenn

Firewall optimized Low Energy Systems

The following table shows Low Energy Systems that we have tested at Thomas-Krenn:

Server	LES v3	invalid id	UNO-2271G V2	Edge 4L	LES v4	LES Plus Ver. 3.1	LES Plus Ver. 4.0	LES network 6L	LES network 6L Ver. 2.0	LES network 6L Ver. 2.1	LES network 6L Ver. 4
special features	fanless 2 NICs Opt. LTE	fanless 4 NICs Opt. LTE	fanless 2 NICs optional 2 additional NICs (2x i350)	fanless low power consumption 4 NICs Opt. LTE	fanless high-performance 3 NICs (2,5Gbit/s) Opt. LTE	fanless high-performance 2 NICs	fanless high-performance 3 NICs	fanless 6 NICs Opt. LTE	fanless high-performance 6 NICs (2,5Gbit/s) Opt. LTE
mainboard	LES v3	LES compact 4L	UNO-2271G-N221AE	FWA-T011L-4CA1S	LES v4	LES Plus v3.1	LES Plus v4	LES network 6L	LES network 6L v2	LES network 6L v2.1 (only i5 Version)	LES Network 6L v4.0
CPU clock frequency Cores / Threads AES-NI Instructions	Celeron N3160 1,6 GHz 4 / 4 Ja	Celeron J3160 1,6 GHz 4 / 4 Ja	Celeron N6210 1,2 GHz 2 / 2 Ja	Celeron J3455 1,5 GHz 4 / 4 Ja	Celeron J6412 2,0 GHz 4 / 4 Ja	Core i5-10310U 1,7 GHz 4 / 8 Ja	Core i5-1235U 1,3 GHz (base clock Perf. Cores) Perf. Cores: 2 / 4, Eff. Cores: 8 / 8 Ja	Celeron 3867U / Core i5-8250U 1,8 GHz / 1,6 GHz 2 / 2 - 4 / 8 Ja	Core i3-10110U / Core i5-10210U 2,1 GHz / 1,6 GHz 2 / 4 - 4 / 8 Ja	Core i5-10310U 1,7 GHz 4 / 8 Ja	Core i5-1235U 1,3 GHz (base clock Perf. Cores) Perf. Cores: 2 / 4, Eff. Cores: 8 / 8 Ja
RAM	2 - 8 GB		4 GB	2 - 8 GB	4 - 32 GB				4 - 64 GB
Disk (SATA)	1	-	-	-	1
Disc (more)	1 mSATA		32 GB eMMC onboard 1 mSATA	1 M.2 SATA 2280	1 M.2 SATA 2280	1 M.2 SATA/PCIe	1 M.2 PCI-E 2280	1 mSATA	1 M.2 SATA/PCIe 2280		1 M.2 PCI-E 2280
NICs 1Gbit (included)	2 (2x i211)	4 (4x i210)	2 (2x i211)	4 (4x i210)	-	2 (2x i210)	-	6 (6x i211)	-		-
NICs 2,5Gbit (included)	-				3 (3x Intel I225-V)	-	3 (2x Intel I226-V)	-	6 (6x Intel I225-V)		6 (6x Intel I226-V)
NICs 10Gbit (included)	-
PCIe slots for additional-NICs	-

Author: Thomas Niedermeier Thomas Niedermeier working in the product management team at Thomas-Krenn, completed his bachelor's degree in business informatics at the Deggendorf University of Applied Sciences. Since 2013 Thomas is employed at Thomas-Krenn and takes care of OPNsense firewalls, the Thomas-Krenn-Wiki and firmware security updates.

Translator: Alina Ranzinger Alina has been working at Thomas-Krenn.AG since 2024. After her training as multilingual business assistant, she got her job as assistant of the Product Management and is responsible for the translation of texts and for the organisation of the department.