MaxDB 7.5 and 7.6 Open Source GPL Download

By | February 1, 2015

A few years ago SAP released its MaxDB under GPL. Newer versions are not open source anymore, but you can still download the open source versions of MaxDB from their FTP server. On all other places in the WEB the software seems  to be gone. Update 9/6/18: The SAP ftp server seems to be gone… Read More »

Bitcoin Mining is Dice Rolling

By | November 9, 2014

In case you didn't already know ... Did you know, bitcoin mining is basically the same as dice rolling? There are many  articles for non-technicians about bitcoin mining, where the mining process is often explained as "solving complex equations". And these equations get more complex, when more miners compete, so the difficulty raises. That's wrong.… Read More »

Zyxel and CAPWAP

By | August 29, 2014

Today I've got a Zyxel NWA 3160-n AP, and I turned it into managed mode to try to connect  it to my open source CAPWAP AC. No luck so far ... Concerning CAPWAP, Zyxel seems to be in no way better than Cisco. The Zyxel AP is (as almost expected) not really CAPWAP-conform, just  like… Read More »

Cisco and CAPWAP IV

By | August 25, 2014

The never ending story ... After my Cisco LAP finally sent it's first join request to my CAPWAP WLC, I stepped into the next problem. The LAP said, after receiving the join response from WLC, the WLC version were not supported. A deeper look at the logs showed, that the LAP was thinking, the WLC… Read More »

Cisco and CAPWAP III

By | August 14, 2014

As I wrote in my last post the Cisco LWAP resets it's clock to zero before joining the WLC, and my assumption was, that the WLC has to send the current time within the discovery response message encoded in a vendor specific payload. Some digging throw the web and experimenting led me to the right message… Read More »

Cisco and CAPWAP II

By | August 13, 2014

After some hard days of debugging, coding and doc-reading, today my Cisco 1131 LWAP finally sent it's first  join request to my Open Source CAPWAP WLC (which is still in an early development stage). I faced a number of problems: It seems, nobody in the world has ever tried to join a Cisco LWAP to a third-party WLC,… Read More »

Cisco and CAPWAP

By | July 28, 2014

So now I've got a Cisco Aironet 1131ag access point, and first it didn't wanted to join the AC-Tube CAPWAP WLC (which is still under development). A long night of debugging and reading log files led me to the result that this access point isn't really CAPWAP conform, when using the latest firmware 12.4.25e from May 2014 or… Read More »

Samsung Galaxy S2 no GPS

By | July 20, 2014

There are many people who have problems with their Galaxy S2 smartphone using GPS. If  the problem occurs, the phone tells you that GPS were not available, and this condition can hold over a period of hours. As many people who have this problem, as many hints and advises you can find, how to fix the… Read More »