Introduction This blogpost shows some useful configurations for the Mikrotik hAP ac² Wi-Fi router 1. These profiles I used for testing purposes are different combinations between switching only, NAT routing, Wi-Fi and LTE by connecting a phone via USB. Product Information The Mikrotik hAP ac² router has 5 Gigabit Ethernet ports, one with PoE, Wi-Fi and USB for 3G/4G support. Technical details 2: Description Configuration Product Name Mikrotik hAP ac² Product Page https://mikrotik.com/product/hap_ac2 Architecture 32 bit ARM OS RouterOS (https://wiki.mikrotik.com/wiki/Manual:TOC) RAM 128 MB Storage 16 MB Flash Ethernet 5 x 10/100/1000 Mbps ports Wireless 2.4 GHz (300 Mbps), 802.11b/g/n 5 GHz (867 Mbps), 802.11a/n/ac USB 1 port, can be used for tethering Power 12-28 V input, max. 21 W Usage Reset Reset the RouterOS configuration: ...

Introduction This post explains how you can manually open a LUKS encrypted logical volume, which can be useful if your encrypted system does not properly boot and you are trying to fix it from a live Linux or if you want to access an encrypted disk from another system. The following steps were performed using the live Linux Grml 1 on a system with LUKS full disk encryption that contains one volume group and several logical volumes. More information can be found in the manpages of the used tools 2 3 4 5 6. ...

Introduction There are a ton of ways to copy data between two systems. You can use a file sharing service on the Internet, transfer files via your self-hosted server or even use USB drives. This blog post shows a very simple and fast solution using IPv6 link-local addresses and a network cable. These link-local addresses allow you to communicate without the need of a router, Internet, static IP configuration or a DHCP server. You just need an Ethernet cable. ...

Introduction Last year, I bought the Birdie CO² monitor 1 to measure my CO² values at home. This air quality meter resembles a canary bird, referencing the days where canaries were used in coal mines to detect deadly carbon monoxide. When these stopped singing (or even collapsed 😥), this was a sign that the air quality was poor, and the workers needed to leave the mines 2. This is how the Birdie looks when the air quality changes from good to bad and again from bad to good: ...

Introduction I recently uploaded a file to a Nextcloud instance. After the upload, I saw that the file timestamp in Nextcloud is already some months old. But I just uploaded it, right? I double checked and saw that it matches the one on my local file system. How is this possible? Is a web application really able to read the last modification timestamp of the file? Apparently. I was not aware of this. In this post, I explain how this works and why you might care about this. ...