Technology blog

The Catch is an online competition/challenge in the computer security organized annually by the Cesnet. I didn't really have time to look into it, but a friend of mine started solving some of the challenges and that finally kicked me in my lazy butt so I decided I can spare few lunch pauses... I...

I quite like the Gitlab way of working with runners, the runner is a small docker container that is managing jobs in other containers, easy to install and maintain. It would be nice if Jenkins could do it too. Well, it actually can, but if need to run jobs in Windows containers, the journey to wor...

When it comes to Enterprise WiFi, the simple - plug-in, set your password and enjoy - approach doesn't work as expected, especially if you have multiple APs around and need to implement fast transitioning between them. Also how to authorize the WPA2-EAP clients in your network? You need some server...

My old Xiaomi Redmi stopped showing red channel, so it was time to enter the hell of Android devices marked and find the least crappy device out there. I've selected the cheap and tiny Cubot KingKong Mini 2 (4 inch phone in 2021? finally someone started making small Android phones!).

The name of t...

When playing with the RFM95 LoRa chip, I was surprised how complicated it is to reduce the power consumption to the values advertised in the datasheet. I happily designed the Picoballon probe for 2021 competition without any means of switching RFM95 the to save some PCB space and weight, the adv...

There's a sentence in the proxmox cluster setup guide: Changing the hostname and IP is not possible after cluster creation. We are running a 4 node cluster that was placed in a legacy network. As the company grew from few people to something bigger, I wanted to split the network into VLANs for i...

I've decided I need a tablet, after week of hair ripping and hitting wall with my head, I've selected the least shitty device I was able to find for a reasonable price (below 200$), the Lenovo M8 FHD. And as with every Android device I ever had, I decided to root it immediately after a first boot (t...

The kresd DNS server on Turris is quite capable, but when you need to do some custom DNS magic for your internal network, it's not good enough. So let's replace it with a full blown DNS server Bind9 aka named.

The Bind9 is a very popular and mature DNS server, other option could be the modern...

The Turris router is a very interesting linux-based networking device with plenty of computing power, it would be pity to use it only as a regular OpenWRT router. It today's world of cyber attacks it can be used as a network monitoring device with an IDS (Intrusion detection system) capability.

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