Cisco SG 300: configure Port Security with MAC filtering

Dec 23, 2014 · 3 min read · cisco ·

If you own a Cisco SG-200/300 switch you are lucky to configure Port Security and MAC filtering. The advantage of this is that you are able to define which MAC addresses may establish connections on particular ports. Other devices will not be able to access the network - which is a good idea especially for public …
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Minimal CRUX-ARM installation

Nov 23, 2014 · 3 min read · raspberry-pi ·

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CRUX-ARM is a Linux distro for ARM devices like the Raspberry Pi that follows the KISS philosophy. If you're looking for a minimalistic system you might want to have a look at the construction kit.

I'm using CRUX-ARM on one of my Raspberry Pi's. The installation fits on a 1 GB memory card. On the project's wiki there …

Short tip: Install Microsoft fonts under Enterprise Linux

Nov 14, 2014 · 1 min read · kurztipp ·

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Some applications still require Microsoft fonts under Linux. Some Linux distros dropped those fonts because of license difficulties. Microsoft offers those fonts for free but redistributing them is prohibited by the used license. Debian-based distros offer a package msttcorefonts-installer which downloads and extracts …
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Sending and receiving mails under Linux usind msmtp and mutt over Microsoft Exchange EWS

Nov 11, 2014 · 3 min read ·

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Especially in Microsoft-embossed environments it might be needed to send and receiver mails over Exchange. Some graphical mail clients like Evolution are offering support for this - of course this is not a good solution for servers without graphical user interfaces.

DavMail is a Java-based platform-independent software …

Short tip: Online update hard drive sizes under Linux

Nov 10, 2014 · 2 min read · kurztipp ·

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When hard drive sizes are altered the Linux kernel isn't informed about these changes automatically. Rebooting the system is a possible solution - but often no option.

Beneath the directory /sys/class/scsi_disk you will find additional files controlling some of the device's function depending on the SCSI id. Using the …

Short tip: VMware ESXi doesn't recognize SSD as SSD

Nov 5, 2014 · 2 min read · kurztipp ·

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During a server installation recently a local attached SSD wasn't recognized as SSD and therefore it was impossible to use it as vSphere Flash Read Cache. Not always the reason for this issue is a controller misconfiguration - sometimes ESXi just doesn't recognize the SSD as flash drive. In this case it is possible to …
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GitBucket: GitHub clone for your intranet

Nov 1, 2014 · 2 min read ·

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GitHub is a very comfortable portal to collaborate source coces. The service manages versions using Git - for documentation purposes bugs and wiki contents can be provided. Especially the open-source scene uses the service a lot but for internal, non-public developments it is only partially suitable.

Premium users are …

Short tip: osad: Unable to connect to the host and port specified (EL6.6 + EL7)

Nov 1, 2014 · 2 min read · red-hat-satellite kurztipp spacewalk suse-manager ·

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Hint from january 2015: the bug has been fixed in the meantime.

I found out that it is currently (11/01/2014) impossible to run osad (Open Source Architecture Daemon) with SELinux enabled on EL6.6 and EL7 systems. The following error message can be seen while starting the service:

 1# service osad restart
 2Shutting …

Mac OS X - report after switching 60 days ago

Oct 29, 2014 · 5 min read · macos ·

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Attentive readers of my blog or Twitter feed might have seen that I'm also spending my time on OS X relevant topics for two months. The reason for this is that I switched the operating system of my notebook from Microsoft Windows to Mac OS X.

Why?

To be honest there was no crucial reason for switching. Since my …

VMworld 2014 Barcelona

Oct 26, 2014 · 7 min read · conference ·

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Last week the european VMworld event was taking place in Gran Via, Barcelona. The program of the 4-day conference was characterised by virtualization and especially VMware products. VMware hosts two events every year - in the USA and Europe.

I had the honour to join this event as press member which gave me the …