Have fun browsing my projects. In case you have any questions, don't hesitate to contact me. I'll answer your e-mail as soon as possible!

If you're interested in a RSS feed, you'll find it here.

Finally, you can search projects or filter them by tags:

7-segment clock

This time I'll present you a little fun project aside the omnipresent network topic in this blog. While moving to another appartment, I had the chance to catch a glimpse of the stuff I stocked in my cellar. Among other things I found some 7-segment displays, some binary counters and 7-segment display drivers.

Have a look what I built with it.

Read more …

2/2 IPSec over GRE with MikroTik's RouterOS and Linux

I finally did it: I wrote the second part...

This is the second part, explaining how to create GRE tunnels between a linux server and a MikroTik Router and encrypt the tunnel using IPSec.

Read more …

iptables rule for L2TP over IPSec

One of my readers wrote me and asked how to setup the host firewall on a L2TP/IPSec server to only allow L2TP connections which are IPSec encrypted. Here is how it is done.

Read more …

curator for elasticsearch

If you would like to groom your elasticsearch database in an automated way, you probably should read this article.

Read more …

FreeSWITCH 1.8.2 on Ubuntu 18.4 LTS

I just updated my FreeSWITCH system.

This article is a simple step by step guid as addition to the initial post.

Read more …

Building a L2TP/IPSec server with OSPF routing capability

Over time, jumpNet's VPN servers became bottleknecks regarding bandwidth. Currently, the best VPN server in jumpNet offers 20MBit/s upstream, which is okay but not sufficient for large file transfers like backups. In this article, I describe how to build a L2TP/IPSec VPN server with OSPF rotuing capability.

Read more …

Updating the ESK stack (elasticsearch, syslog-ng, kibana)

Just a short notice on my ESK experiences regarding updating the stack.

Read more …

nginx as simple reverse proxy for HTTP basic auth

In my last post, I described how to set up a ESK stack (Elasticsearch, syslog-ng, Kibana). I also mentioned that the provided setup is not ideal from a security perspective. In this post I'll show you, how to use nginx as HTTP reverse proxy with HTTP basic auth to protect the Kibana web frontend.

Read more …

pimp my syslog server or "Setting up a syslog server with syslog-ng, Elasticsearch and Kibana"

The jumpNet grows, so do the logs. A little tired of grepping and tailing and lessing it came handy that I needed a solution for a customer with similar needs. After doing some research in the internet, I came across the so called ESK stack. Elasticsearch, syslog-ng and Kibana. Sure, I heared about Elasticsearch and Kibana, but till then I thought this is some hipster IT crap and - I never was so wrong. (Yeah, there is some prejudice coming with age and experience...)

Read more …

I was a webhoster

Several years ago, I was interested in webhosting technologies. As servers and elecricity didn't pay for themselves, I founded a small web hosting business to fund my hobby.

Read more …