Category Archives: Off-Topic

Alles was nichts direkt mit Technik, Netzwerken, Internet & Co. zu tun hat. Muss auch mal sein.

My IPv6/Routing/Cisco Lab Rack (2019)

My lab rack of 2019 consists of multiple Cisco routers and switches, as well as Juniper ScreenOS firewalls for routing purposes, a Palo Alto Networks firewall, a Juniper SRX firewall, a server for virtualization and some Raspberry Pis. That is: This rack can be used for basic Cisco courses such as CCNA or CCNP, or for even bigger BGP/OSPF or IPsec VPN scenarios since those ScreenOS firewalls are perfect routers as well. Of course, everything is IPv6 capable. Having some PoE-powered Raspberry Pis you can simulate basic client-server connections. A Juniper SA-2500 (aka Pulse Connect Secure) for remote accessing the Lab rounds things up.

I am just writing down a few thoughts on why I have “designed” the rack in that way. It’s basically a reminder for myself. ;)

Continue reading My IPv6/Routing/Cisco Lab Rack (2019)

Urlaub ohne Internet & Smartphone – ein Traum!

Zum wiederholten Mal habe ich es getan: Ich war zwei Wochen mit der Familie im Urlaub – und zwar ohne Smartphone, ohne Tablet, ohne Notebook, ohne Fernseher. Offline! So ganz. 14 Tage lang. Und das war auch gut so. Urlaub eben.

Also zumindest so, wie ich es wirklich als Urlaub wahrnehme. Und meiner Meinung nach auch die einzige Möglichkeit, in unserer heutigen Zeit wenigstens einmal im Jahr ganz abzuschalten.

TL;DR: Smartphone zu Hause lassen -> Urlaub wieder zur Zeit des Ausruhens machen!

Continue reading Urlaub ohne Internet & Smartphone – ein Traum!

Blog Financing

Let me post some words about financial issues concerning this blog. Well, it’s kind of annoying. I am writing blogposts for fun in my free time because I want to document my work in a proper way and I want to “give something back” to the community. It is not my primary goal to earn money with this blog at all.

However, I have some costs for hosting as well as for the equipment within my laboratory. For this purpose, I placed ads by Google AdSense inside my articles. 2-3 banners; depending on the size of the blogposts. Unfortunately, this brings only about 70 cents per day. ;( This is really not that much and does not suffice for the costs. What’s the problem? All of us (including me *g*) have adblockers installed. I know I know. Furthermore, no employee will donate to my blog, since companies simply don’t have a need to donate. And why should an admin donate from his private pocket?

Hence I have one request for you:

If you’re reading my blog regularly, please be fair and turn off your adblocker. Or even better: donate a couple of Euros. ;) I would really appreciate it. Thanks a lot! –> <–

Continue reading Blog Financing

The first 5 Years of

Today my blog celebrates its 5th birthday as I published my Master Thesis about IPv6 Security on the 6th of May, 2013. Wow. When I started back then I did not expect that I will blog almost once a week for that many years and that the blog gets that many readers. ;)

With this blogpost I’ll give you some insights about the stats of the blog and some plans for the future. Furthermore I am highly interested in comments from you. What do you think about the blog in general? What is good, what could I improve? Where do you agree or disagree. Please write some comments to give me some feedback. Thanks a lot!

Continue reading The first 5 Years of

Wie man als arbeitender Familienvater 399 € Elterngeld bekommt

Unser erstes Kind kam während des Studiums. Sprich: Elternzeit konnte ich mir keine nehmen (oder ich hätte ein ganzes Semester verlängern müssen) und fürs Elterngeld gab es immerhin den Mindestsatz von 300,- €/Monat. Gut geplant kam also das zweite Kind zu einem Zeitpunkt, an dem ich bereits einige Monate voll verdienend unterwegs war. Entsprechend höher erwarteten wir auch das Elterngeld. Schock und große Ärgernis dann aber, als ich auch dieses mal lediglich den Mindestsatz bekommen sollte, da die Berechnung des Elterngeldes nicht meinen richtigen Job, sondern meinen Nebenjob während es Studiums als Grundlage nahm. Arg! Was sollte das denn???

Continue reading Wie man als arbeitender Familienvater 399 € Elterngeld bekommt

Bye Bye Maglite

Auch ich merke, dass ich älter werde. Mittlerweile ist es soweit, dass Technik, die “zu meiner Jugendzeit” hochaktuell war, total veraltet ist. Ein schönes und für mich trauriges Beispiel ist die Maglite. DIE Taschenlampe der Cops in den USA, welche man sogar als Schlagstock verwenden kann! Längst wurde sie durch eine high-tech LED Taschenlampe (in meinem Fall eine ThruNite) ersetzt. Hier ein paar Abschiedszeilen…

Continue reading Bye Bye Maglite

BOINC Load depends on Processor Type

I am running two old notebooks in my laboratory for several server purposes. Last year, I started to support the World Community Grid project with the idle times on these laptops. Nothing interesting so far. However, it is interesting to track the load of the CPUs since they vary on both laptops due to the projects that require different CPU types.

Continue reading BOINC Load depends on Processor Type

Happy Birthday to my Blog! :D

Yeah, exactly one year ago I published my first blog post, my IPv6 Security Master Thesis. Though I thought that I won’t publish that many articles furthermore, I continued to write blog posts. Now, one year later, I have published 54 articles – more than 1 article per week. Wow. So it’s time to say. Happy Birthday to my Blog! :D

For those who are interested: In this post I am showing a few statistics, list my used WordPress plugins and will give a short preview to upcoming blog posts.

Continue reading Happy Birthday to my Blog! :D

Published Link on Twitter: Immediate Accesses from Unkowns

I made the following observation: Just after publishing a link on Twitter, there are several accesses from different IPv4 addresses on that URL. Since I published a link to one of my own servers, I saw these connections on the firewall as well as on the server itself. They all called the http website and stayed for 2-3 seconds on that page.

I would have expected a few search engine bots, but most of the reverse lookup resolutions led to unknown or meaningless names. Maybe someone out there made the same observation with more details on that? Who is accessing the links? Automated bots from Twitter itself? Search engines? Malware bots searching for new victims? ;) And over which function do these hosts know, that someone has published a new link?

Continue reading Published Link on Twitter: Immediate Accesses from Unkowns