IT Administration

How to enable EAP-MD5 on Windows 7

A short description how to enable EAP-MD5 authentication for wired 802.1x authentication on Windows 7 since it has been (correctly) disabled for security reasons

DNSSEC (manuell) mit BIND Werkzeugen

How to automate DNSSEC signatures on a manually managed zone

Speicherprobleme bei Android auf älteren Geräten umgehen

A short description of the davlik.vm.* tuneables for memory management tuning on Android devices

Automatic domain validation TLS certificates with and let's encrypt with own DNS servers

A tutorial on how to automatically manage TLS certificates for various services with DNS challenges and an zone served out of a bind zonefile that is protected via DNSSEC.

How to setup an TOR hidden service

A short description how to setup a TOR hidden service or an stealth hidden service and why one would want to do that even if one doesn't offer illegal content

Adding tags for indexing webpages with Jekyll

An easy method to add tags to your static Jekyll generated pages and blogs

Wie DKIM und SPF funktioniert (und weshalb Mail-Forwarding eine schlechte Idee ist)

This is an article (in German because of it's specific audience) about SPF and DKIM features that prevent mail spoofing and it's effects on mail forwarding

The Blogsphere - How pingbacks work

The blogsphere is a web of interconnected websites. As usual websites are linked like all pages in the WWW but on the other hand they provide an easy way of notifying each other of being referenced by a third party. Pingback is - besides trackbacks - the (XML-RPC based) technology used for that notification.

What are JSON web tokens any why would one want to use them?

Just a short description of what a JWT is, what it can do for one and how they are realized - and why one would want to use them to identify users in one's web application by using JWTs instead of session IDs.

What is Multifactor authentication (MFA) and how to use a Yubikey on FreeBSD for Web and PAM (Local, SSH, etc.) authentication

This article contains a short tutorial about multifactor authentication, various factors that may be used and a tutorial on how to use the Yubikey hardware token for web- and local as well as SSH (pam) authentication on FreeBSD.

Configuring ADSL PPTP connection (for example with Austrian DSL providers) on FreeBSD with mpd5

A short summary on how to configure mpd5 to authenticate against an external PPP provider for PPPoA usage (via PPTP). This is required for authentication with most Austrian (A)DSL providers when using their modems in single user mode.

Using an IPv6 tunnel broker

How to get an IPv6 network connection working if your ISP doesn't support IPv6 even today. Also includes a short description on how to do this on an connection using dynamic endpoint adresses.

Simple usage of Kerberos for SSH authentication on FreeBSD

A short primer on how to get started using Kerberos for authentication inside your network. This includes setup of an kerberos key distribution center (KDC) on an secure host as well as of the server machines against which one will authenticate as well as the required configuration on the clients.

Using a bluetooth mouse with FreeBSD

18 Feb 2020 - tsp

Summary on how to enable a bluetooth mouse on FreeBSD

Automatic Ethernet and WiFi failover on FreeBSD

28 Feb 2020 - tsp

Short introduction on how to use lagg(4) to perform automatic switching from ethernet to WiFi and back on FreeBSD.

Dipl.-Ing. Thomas Spielauer, Wien (

This webpage is also available via TOR at http://jugujbrirx3irwyx.onion/

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