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22 May 2026

  • 10:1010:10, 22 May 2026 Setup of Mailman in Debian (hist | edit) [14,354 bytes] Aranzinger (talk | contribs) (Created page with "'''GNU Mailman''' is a software for administrating mailing lists for free. In this article, we describe how to setup Mailman on Debian Lenny (Debian 5.0). At Thomas-Krenn, we use Mailman for mailing lists of the IPMI Sensor Monitoring Plugin. == Install MTA == For the operation of mailing lists with Mailman, the MTA (Mail Transfer Agent) is required. During the subsequent installation of Postfix, select '''Internet Site''' as the 'General type of mail configuration...")
  • 07:0107:01, 22 May 2026 Setting up password authentication with Active Directory on Debian (hist | edit) [6,975 bytes] Aranzinger (talk | contribs) (Created page with "Central directory services such as OpenLDAP or Active Directory (AD) simplify the '''password management''' for administrator and user. With regard to Linux server, the aspect of the SSH '''authentication''' via AD is interesting. From an IT security perspective, this solution also has its advantages: * Administrators do not have to choose and administrate different passwords for every server. You can log in to the servers with the AD password. * The password change or d...")

21 May 2026

  • 13:1613:16, 21 May 2026 PCIe link lost (hist | edit) [10,734 bytes] Aranzinger (talk | contribs) (Created page with "On Linux systems, when using Intel I350 network chips, messages such as '''PCIe link lost''' may appear, followed by '''igb 0000:82:00.0 enp130s0f0: malformed Tx packet detected and dropped, LVMMC:0xffffffff'''. Therefore, the affected network interface does not work. As a solution, the Linux kernel parameter '''pcie_aspm.policy=performance''' or an updated BIOS with deactivated ASPM can be used. == Affected hardware and software == We have encountered this issue i...")
  • 09:0909:09, 21 May 2026 MegaRAID 9341-4i Debian 11 DMAR DRHD handling fault status reg 3 (hist | edit) [5,244 bytes] Aranzinger (talk | contribs) (Created page with "After installing Debian 11 on a system with MegaRAID 9341-4i RAID controller, messages such as '''AVAGO EFI SAS Driver is Unhealthy''' may appear during the boot process and '''DMAR: DRHD: handling fault status reg 3''' in the system log. In this article, we explain how to solve this problem by using the kernel parameter '''intel_iommu=on iommu=pt'''. == Description of problem == After installing Debian 11, the following problems appear on a system with MegaRAI...")
  • 07:5607:56, 21 May 2026 Debian 11 installation with DMAR DRHD handling fault status reg 3 error message (hist | edit) [4,446 bytes] Aranzinger (talk | contribs) (Created page with "When installing Debian 11 on systems with a MegaRAID 9341-4i RAID controller, it may come to error messages such as '''AVAGO EFI SAS Driver is Unhealthy''' during the starting process and '''DMAR: DRHD: handling fault status reg 3 '' when starting the operating system. In this article, we show how to install Debian 11 by using the kernel parameters '''intel_iommu=on''' and '''iommu=pt'''. == Error message in the BIOS, during boot process and installation == In this ca...")

20 May 2026

  • 09:3909:39, 20 May 2026 Security advisories on Intel products 2026.2 IPU (hist | edit) [2,700 bytes] Aranzinger (talk | contribs) (Created page with "In '''2026''', Intel published new security advisories as part of the IPU 2026.2 on different Intel products. Some of these security advisories require '''firmware updates'''. In this article, you will find an excerpt and hints on these security advisories as well as information on where to find updates for Thomas-Krenn products. == Affected systems == * Intel Xeon processors * Intel Core processors * Intel Atom processors * Intel Pentium processors * Intel Celeron...")
  • 07:5307:53, 20 May 2026 AMD Security Vulnerabilities - May 2026 (hist | edit) [8,768 bytes] Aranzinger (talk | contribs) (Created page with "On '''May 12th, 2026''', AMD published the security bulletins '''AMD-SB-3030''' <ref>[https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3030.html AMD EPYC and AMD EPYC Embedded Series Processor Vulnerabilities – May 2026] (www.amd.com/en/resources/product-security)</ref>, '''AMD-SB-4017'''<ref>[https://www.amd.com/en/resources/product-security/bulletin/amd-sb-4017.html AMD Athlon, AMD Ryzen, and AMD Ryzen Embedded Series Processor Vulnerabilities – Ma...")

15 May 2026

  • 10:2510:25, 15 May 2026 NIC bonding on Debian (hist | edit) [2,149 bytes] Aranzinger (talk | contribs) (Created page with "==Different kinds of bonding== * mode=0 (balance-rr) * mode=1 (active-backup) * mode=2 (balance-xor) * mode=3 (broadcast) * mode=4 (802.3ad) (see also Link Aggregation and LACP basics) * mode=5 (balance-tlb) * mode=6 (balance-alb) == Install packages == apt-get install ifenslave-2.6 == Configuration Debian 5.0 Lenny and newer == In this example, we explain a configuration with mode 4 (802.3ad). For the link aggregation, we use: * eth0 and * eth1 <code>/etc...")
  • 07:4207:42, 15 May 2026 Reset IPMI password (hist | edit) [3,669 bytes] Aranzinger (talk | contribs) (Created page with "This article describes how to reset the '''password''' of an '''IPMI module'''. Please note that on Supermicro systems, the maximum password length is effectively 19 characters when setting a new password (The array length is 20 characters and the string is NULL-terminated, leaving 19 characters available). <ref>[https://www.supermicro.com/support/faqs/faq.cfm?faq=16778 What is the maximum password length for IPMI?] (Supermicro FAQ 16778)</ref> ==Resetting the password...")

11 May 2026

6 May 2026

29 April 2026

  • 11:1711:17, 29 April 2026 Internet-Speed-Test with LibreSpeed (hist | edit) [4,558 bytes] Aranzinger (talk | contribs) (Created page with "There are websites for testing the own '''internet speed''' offered by a lot of providers. The most services of this kind collect '''multiple local data''' in such tests, which is why they are '''not without risk from a data protection perspective'''. The open source alternative '''LibreSpeed''' offers a data-efficient alternative. == Data collection of conventional speedtest-alternatives == Traditional providers of internet speed testing services collect a large amoun...")
  • 09:2809:28, 29 April 2026 TKMI Settings (hist | edit) [4,880 bytes] Aranzinger (talk | contribs) (Created page with "== Menu == {| class="wikitable" style="width:100%;" | style="width:240px; text-align:center;" | 220px|overview | '''Overview'''<br> Overview of the settings available in the TKMI. |} == System and basic configuration == {| class="wikitable" style="width:100%;" | style="width:240px; text-align:center;" | 220px|configure date and time | '''Date & Time'''<br> The '''date, time and time synchronizat...")
  • 07:3907:39, 29 April 2026 TKMI Remote Control (hist | edit) [1,926 bytes] Aranzinger (talk | contribs) (Created page with "The TKMI provides '''remote control''' functions for remote operation '''and direct interaction with the system.''' These include, in particular, the remote KVM console as well as additional control and management options. In the following, the individual sections are explained. == Overview == small|220px|Remote Control Menu This section provides '''access to the remote KVM console (H5Viewer)''' as well a...")

21 April 2026

20 April 2026

  • 11:1411:14, 20 April 2026 AMD Security Vulnerabilities - April 2026 (hist | edit) [8,308 bytes] Aranzinger (talk | contribs) (Created page with "On '''April 14th''', '''2026''', AMD published '''AMD-SB-7054''' Security Bulletins <ref>[https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7054.html Incorrect use of LocateProtocol Service of the EFI_BOOT_Services table in SMI Handler – April 2026] (www.amd.com/en/resources/product-security)</ref>, '''AMD-SB-3034'''<ref>[https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3034.html SEV-SNP Routing Misconfiguration – April 2026] (www.amd...")

17 April 2026

  • 10:1310:13, 17 April 2026 Windows Secure Boot certificate expiry (hist | edit) [4,966 bytes] Aranzinger (talk | contribs) (Created page with "In this article, we explain how to read out the secure boot certificate. The previous certificates have been issued in 2011 which expire this year. == Which certificates are affected? == Term explanation: * '''KEK:''' Key Enrollment Key * '''CA:''' Certificate Authority * '''DB:''' Secure Boot Signature Database * '''DBX:''' Secure Boot Revoked Signature Database {| class="wikitable" |+Summary table !Expiring certificates !Expiry date !New certificate !Location !P...")

16 April 2026

  • 10:5410:54, 16 April 2026 Activation of Q-Feeds webinterface and licenses (hist | edit) [2,352 bytes] Aranzinger (talk | contribs) (Created page with "Q-Feeds, the cybersecurity plugin, provides a Cloud platform with a variety of information. With this, licenses can be added to the own account and tokens can be created for devices such as OPNsense-firewalls. This article shows how to '''add a license''' and '''create a token for your firewall''' in the '''Q-Feeds Threat Intelligence Platform v2.3'''. {{#widget:Imagebox-left|link={{#tklink:type=sitex|id=21563|linkonly=1}}|image=/de/wikiDE/images/8/84/Q-Feeds-Sh...")

9 April 2026

  • 10:3510:35, 9 April 2026 Q-Feeds Connect Installation under OPNsense 26.1 (hist | edit) [5,010 bytes] Aranzinger (talk | contribs) (Created page with "The Open Source Firewall OPNsense can be enhanced by integrating Q-Feeds firewall blocklists and DNS filter rules with the latest threat intelligence. This article shows how to install '''Q-Feeds Connect plugin and how to create firewall rules''' and '''Unbound DNS filter rules''' under '''OPNsense 26.1'''. {{#widget:Imagebox-left|link={{#tklink:type=sitex|id=21563|linkonly=1}}|image=/de/wikiDE/images/8/84/Q-Feeds-Shopbanner.png|text=Click here for our Q-Feeds Conne...")

8 April 2026

  • 10:1210:12, 8 April 2026 Q-Feeds Versions: Feature Comparison (hist | edit) [3,994 bytes] Aranzinger (talk | contribs) (Created page with "Next-Generation-Firewalls (NGFWs) are important tools to protect networks. You can filter DNS and web traffic using external dynamic lists of threat indicators, known as Indicators of Compromise (IoCs). Q-Feeds provides dynamic and updated lists of these IoCs that were specifically designed for use with security controls such as NGFWs. By adding Q-Feeds as a plugin to OPNsense firewalls, you can enhance protection against new and emerging threats. This means that OPN...")

2 April 2026

  • 10:2410:24, 2 April 2026 Cloud Computing Concepts (hist | edit) [4,056 bytes] Aranzinger (talk | contribs) (Created page with "The term '''Cloud'''—actually cloud computing—is a term for various concepts related to the delivery of IT services. These can be broadly divided into three categories and classified using the cloud computing stack. This article provides an overview of these concepts. == Cloud Computing Stack == file:Cloud Computing Stack.jpg|250px|thumb|right|Cloud Computing Stack.<ref>[http://oracle-help.com/oracle-cloud/...")

26 March 2026

  • 14:4514:45, 26 March 2026 Boot-Device Replacement - Change of Proxmox ZFS Mirror Disk (hist | edit) [14,502 bytes] Aranzinger (talk | contribs) (Created page with "These instructions describe the '''change of a boot device''' in a '''Proxmox VE (PVE) host system''' '''with ZFS-mirror'''. This change is necessary, when a disk is damaged or has failed in the compound. In this article, it is explained what to do after a system hard drive failure. Options for different boot-loaders ("GRUB" or "systemd-boot") are explained. Furthermore, it is explained how to change a hard drive within a PVE so that the used mirror is completely ''o...")

25 March 2026

  • 14:5514:55, 25 March 2026 Backup and restore under Debian 13 with Proxmox Backup Client (hist | edit) [6,375 bytes] Aranzinger (talk | contribs) (Created page with " This article describes how to back up a '''Debian 13''' system with the help of '''Proxmox Backup Clients''' on a Proxmox Backup server. == Initial situation == For the performance, a '''Proxmox Backup Server''' and a '''Debian 13''' system, that you want to back up, is required. If you '''did not install a PBS yet''', you will find the instructions for the installation here: Proxmox Backup Server Installation. == Proxmox Backup Client == In this paragraph, the...")
  • 07:4307:43, 25 March 2026 VirtualBox (hist | edit) [8,038 bytes] Aranzinger (talk | contribs) (Created page with "'''VirtualBox''' is a virtualization solution from Oracle. VirtualBox was originally developed by Innotek, which was later acquired by Sun Microsystems. In 2010, Oracle acquired Sun, including VirtualBox. VirtualBox runs on Windows, Linux, Mac OS and Solaris. == General information == * Documentation: http://www.virtualbox.org/manual/UserManual.html == Versions == === VirtualBox 6.1 === * Most important new features (excerpt) in version 6.1: ** Now supports importi...")

24 March 2026

  • 14:0314:03, 24 March 2026 Advantech Industry Firewall server (hist | edit) [6,880 bytes] Aranzinger (talk | contribs) (Created page with "For the operation of an open source firewall such as OPNsense, a multiple number of different server systems is suitable. In this article, we present Advantech Industry Firewall systems that were tested with OPNsense at Thomas-Krenn. {{#widget:Imagebox-left|link={{#tklink:type=sitex|id=20777|linkonly=1}}|image=/de/wikiDE/images/0/0f/OPNsense-Shopbanner.png|text=Click here for our OPNsense Industry Firewalls in the Thomas-Krenn online shop|campaign=Advantech Industr...")
  • 13:2413:24, 24 March 2026 Overview of virtualization technologies (hist | edit) [3,519 bytes] Aranzinger (talk | contribs) (Created page with "== Technologies == === Hardware emulation === In hardware emulation, all hardware components (CPU, chipset, I/O cards, etc.) are emulated. The CPU emulation translates hardware instructions from the emulated to the native CPU (for example emulation of PowerPC, ARM, SPARC, MIPS, ... on x86). This results in significant overhead and, consequently, a loss of performance. Guest operation systems can be operated without adjustments. Examples for hardware emulation: * [ht...")

23 March 2026

  • 13:4713:47, 23 March 2026 OPNsense FAQ (hist | edit) [19,260 bytes] Aranzinger (talk | contribs) (Created page with "In this article, you will find answers on frequently asked questions about the Open Source firewall OPNsense. {{#widget:Imagebox-left|link={{#tklink:type=sitex|id=19293|linkonly=1}}|image=/de/wikiDE/images/0/0f/OPNsense-Shopbanner.png|text=Click here for our OPNsense firewalls in the Thomas-Krenn online shop|campaign=OPNsense FAQs }} {{#widget:SitexBox|link={{#tklink:type=sitex|id=19293|linkonly=1}}|text=Click here for our OPNsense firewalls in the Thomas-Krenn onli...")

20 March 2026

17 March 2026

16 March 2026

  • 14:1314:13, 16 March 2026 KeePassXC password manager (hist | edit) [3,785 bytes] Aranzinger (talk | contribs) (Created page with "'''KeePassXC''' is an open source password manager for Windows, Linux, BSD and Mac OS that uses the KeePass 2.x (.kdbx) data file format for safing passwords. Such a data file format can also be used with other systems, for example with KeePassDX (open source password manager for Android) when the file is copied there. == Safety == KeePassXC '''does not perform a synchronisation''' about cloud providers. '''All passwords remain on your own computer''' (unless...")

13 March 2026

  • 10:0910:09, 13 March 2026 Supplement to safety instructions for Intel products 2026.1 IPU (hist | edit) [1,942 bytes] Aranzinger (talk | contribs) (Created page with "In March '''2026''', Intel published new security advisories for different Intel products with regard to IPU 2026. Some of these safety instructions require '''firmware updates'''. In this article, you will find an excerpt and hints on these security advisories as well as information on where to find updates for products from Thomas-Krenn. == Security advisories == In the following, you will find safety instructions on the firmware published by Intel. {| class="wiki...")

12 March 2026

9 March 2026

6 March 2026

  • 10:0610:06, 6 March 2026 Qemu drive cache option (hist | edit) [15,412 bytes] Aranzinger (talk | contribs) (Created page with "'''Quick Emulator''' ('''QEMU''') is an Open Source emulator that emulates virtual hardware. QEMU can be used in combination with KVM and is used in this way in Proxmox. In this article, the QEMU drive option "cache" will be explained. The configuration of a QEMU drive contains the generation of a block driver node (backend) as well as a guest device. == cache option == The option "cache" controls how the host cache is used for the access on block data. The "cache" con...")

5 March 2026

  • 15:1815:18, 5 March 2026 Ext4 Write Barriers (hist | edit) [25,298 bytes] Aranzinger (talk | contribs) (Created page with "''' Write barriers '''are used in the Linux kernel to ensure that data that has been written is actually written to a data carrier '''permanently '''before further new data is written. The use of write barriers ensures that even in the event of a sudden power failure,''' no data written via fsync() is lost. '''Write barriers force the''' correct sequence of journal-commits''' of the file system on the data carrier which allows volatile write caches to be used safely...")

3 March 2026