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Bachelor Thesis: Like-Charge Attraction in DNA

My Bachelor thesis was published a few days ago. It is available at the Institute of Computational Physics at the University of Stuttgart as well as here. Download

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SSDs with TCG Opal or IEEE-1667 support

Recently, a few SSD models have been introduced that support Full-Disk Encryption per the TCG Opal standard. Many older SSDs already support AES encryption and use the ATA password for this, which is...

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CUPS on OS X hangs after a few days, reports “Internal Server Error”

If you set up CUPS on an OS X Server (version 10.8.5 in my case, but anything from 10.7 (where CUPS introduced sandboxing) through 10.9 (the current version) should exhibit this behavior), i.e. you...

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Leserbrief “Rentenpaket”

Am 29. Januar 2014 beschloss die Bundesregierung die als “Rentenpaket” bekannte Rentenerhöhung. Unmittelbar darauf präsentierte Arbeitsministerin Andrea Nahles eine Werbekampagne dafür; über die am 30....

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VMware ESXi 5.5.0 panics when using Intel AMT VNC

For compatibility with a new guest OS, I upgraded my ESXi  to 5.5 today. During reboot, it crashes after a few seconds (it briefly flashes a message about starting up PCI passthrough on the yellow ESXi...

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Calling the parent constructor in PHP 5

Say you write a PHP class that needs to call the parent constructor. At first sight, this is simple: function __construct() { parent::__construct(); } Say you want to pass some arguments to the parent...

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WordPress Plugins

After I recently set up a blog for a friend, I thought I’d post a list of plugins I use on the various WordPress instances I run for various people and myself. Simple Custom CSS. Allows you to add...

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CUPS-to-CUPS printing with server-side processing and page_log

Printer sharing on Windows is easy: the client receives the driver from the server, presents the driver GUI and passes on an intermediate format along with the options selected in the driver to the...

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Sipura SPA-3000 spontaneous reboots, reason 0x737208f4

I have a 10-year-old Sipura SPA-3000 VoIP phone adapter (SIP to FXS phone) which at some point started rebooting once an hour, even during calls. After enabling remote syslog, I saw that these reboots...

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Wifi with WPA/WPA2 mixed mode encryption on Snom phones

When you try to connect a Snom phone to a Wifi network, make sure the network isn’t running in mixed WPA/WPA2 mode. The phone will see the network anyway, but fail to connect at boot. Disabling WPA in...

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Asterisk: Change number in To header

A long time ago, I wrote about changing the callee ID as seen by the caller using CONNECTEDLINE. Changing the caller ID as seen by the callee is also pretty obvious using CALLERID. That leaves two more...

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Asterisk 11 und Sipgate Basic

Für ältere Asterisk-Versionen hat Sipgate in seinen FAQs passende Einträge für die sip.conf aufgeführt. Unter Asterisk 11 hat sich leider die NAT-Behandlung etwas verändert (nat=yes gibt es nicht...

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Crossflashing Dell PERC H200 to LSI 9211-8i

OEM version of the LSI SAS 9211-8i, such as the Dell H200, H310 or IBM M1015 are quite popular for use with FreeNAS. However, they need to be flashed with a regular LSI firmware to disable their RAID...

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PHP 5: ldap_search never returns when searching Active Directory

I recently moved a PHP web application from a server running PHP 5.3 on Mac OS X 10.6 to a newer one with PHP 5.4 on Mac OS X 10.9. This caused the following code sample, run against an Active...

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