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Link aggregation

Sun, 08 Dec 2024 16:41:02 +0100

Problem statement #

The new switch supports 2,5 Gigabits, the computer connected to it has multiple network ports all of which have only 1Gbit and we want more speed than a single port offers, so we connect multiple ports to the switch.

Nomenclature #

This is sometimes referred to as “Link aggregation” and also sometimes called “Trunk Group Setting”, which is confusing because Cisco calls its 802.11q VLAN tagging something with trunk as well (that is unrelated to link aggregation).

omg!ipv6

Thu, 24 Mar 2022 23:30:38 +0100

When I say I got ipv6 working I can imagine you may be asking how that is special and you are right, theoretically at least. Practically I faced a surprising amount of difficulties when I tried to configure my FreeBSD router to get an ipv6 address from my internet service provider. Because of that I configured my OpenVPN to route ipv6 traffic as an intermediate solution. That however also took more time than I would have expected, because there is just not enough documentation on the internet at this point in time and especially when it comes to the question: How to route ipv6 from a jail over an epair device. I mean… Try it, if you like, but I will soon publish an article about that topic here and that could help you to save a lot of time. So either believe me or proof to yourself, that you are more intelligent than me and that you can do the same thing with ease. No problem, only that I refuse to add a comment section to my website, so nobody will ever get to know, except… Wait… You could very well post about your success on some social network. Feel free to do so and do not forget to link my website. I like visitors, but google does not like my site.

Released emocli

Sat, 23 Oct 2021 14:50:38 +0200

emocli is a little bash script, which is able to display most of the emoticons and symbols found in Wikipedia articles about Unicode and Charsets. The tool does not present an overview and is not meant as a replacement for gnome-characters, but better suited to test the capabilities of different terminal emulators: The script can add modifiers to the smilies and request a text-only representation by doing so. Not all terminal emulators support that today. You can also use it to test ’new’ standards, e.g. the emoticons skin color tone after Fitzpatrick and wonder how few emoticons are supported at this time.

Released vim-under-the-cursor

Sat, 09 Oct 2021 23:14:43 +0200

vim-under-the-cursor Underlines all occurances of the word under the cursor and additionally displays the color under the cursor if it is written as a hex value. The alpha-channel (#rgba colors) is also supported and changes the brightness of colors.

Released vim-fancy-line

Sun, 16 May 2021 00:00:00 +0000

vim-fancy-line was released today: A minimalistic, fast and good looking status- and tabline for Vim.

Xfce/Thunar contribution

Sun, 14 Mar 2021 00:00:00 +0000

This is no spectacular change, but it is really awesome how easy it is to contribute to the Xfce project thanks to its maintainers like Alexander Schwinn. Thank you! This really encourages further involvement.

apu4d4

Sun, 07 Mar 2021 00:00:00 +0000

I was looking for a way to use FreeBSD as router OS in my home. Its purpose was to route OpenVPN traffic from and to my network, so that an individual host configuration becomes unnecessary. My first setup was based on a raspberry pi and that works good enough and is so simple, that it can easily be fixed if something breaks.

I further improved the setup and installed a local DNS recursor in order to get DNS under my control. That allowed me to name my devices relative to a local domain, optimize the recursor cache to my needs and use DNS servers from the opennic project for which I needed the cache optimizations the most.

Raspberry infrared camera drill template

Sun, 07 Feb 2021 00:00:00 +0000

This camera is available online and gets seriously warm when turned on. Also it is hard to mount in this form. Or short: A case is necessary and here is the drill template for it (in SVG-Format)

And the result is good enough:

Smart home

Tue, 01 Dec 2020 00:00:00 +0000

I have never found it noteworthy that I have installed LED strips behind my main monitors, because it used to be too dark there and was hurting my eyes. For many years I had a crude LED-strip in a cable tie construction, not very nice from a construction point of view, but as durable as such temporary solutions always get. I have now upgraded the setup and for anybody interested in how my desktop looks like today, here it is:

Released vim-recently-used

Thu, 16 Jul 2020 22:27:58 +0200

vim-recently-used shows a list of recently used files from the current directory when starting Vim.

Vim contribution

Tue, 07 Jul 2020 00:00:00 +0000

I am confident to speak for others as well when I thank Bram Moolenaar for accepting my pull request so quickly.

I am really impressed, that you really did that by yourself. I was not expecting that, because its unusual to be recognized by rock stars when participating in their concerts.

However I realized, that what this means to me could potentially be something I could give to others as well. Not because I am a rock star, but rather because nobody is. We are all humans and we can change the world for the better. Thanks for reminding me!

And still...

Tue, 07 Apr 2020 00:06:06 +0200

Some time ago my blog software broke and I could not help but did not feel like fixing it. That was now the situation for almost one year and until today and it was never supposed to take that long, nor does it mean that I will quit with anything. I am still here, I still work on my projects and below you find a picture of my latest project, which I will eventually release as an open source project.

Drill templates for analog meters

Wed, 21 Nov 2018 00:00:00 +0000

Here are some drill templates for cheap analog meters. No waranties, worked for me (tm).

50-43 #

glabels, pdf

85c1-85l1 #

glabels, pdf

85x1_85l1_dh670 #

glabels, pdf

In system program the UEFI BIOS

Sat, 17 Mar 2018 16:55:08 +0100

Apart from looking so crude: This device actually worked! I was able to re-flash the UEFI BIOS directly on the motherboard and the computer starts again! More important is though, that after that worked, there is no reason to NOT further play around with the BIOS anymore. Watch out for news or try it on your own. An interesting low-level world has forgotten to lock its gate ;) The whole story: I faced a serious issue with my computer the other day, when it wasn't booting any more and stuck on the BIOS logo screen. I tried DEL and the F* keys, but the system did not respond by any means. But I further noticed, that -within a certain time frame- the NUM lock key worked with a remarkable delay before the LED reacted. I removed all components, even one of the two RAM sticks I have- still the same thing. Since the board had a dual bios, I tried to re-flesh the first from the second by holding the on switch for a few seconds. Although that seemed to work it did not fix the issue. I removed and reinserted the bios battery and started bridging pins of the BIOS chip in order to erase it until I managed to get the computer in an even worse state in which it turned on and again off very quickly without showing anything on the screen. I managed to destroy my BIOS and that used to be something for which you have send your board back to its manufacturer or buy a new one. But I was still not ready to give up on it and after some soldering and bug fixing I came up with a really crude solution, which I now want to share with you, because this thing looks so terrible, even though it worked :D Note: I also tried a direct connection with a more recent Raspberry Pi 3, but for that additional resistors would be required.

solder fume extracting lamp

Sat, 27 Jan 2018 23:47:28 +0100

Upcycling of an old and defective ATX power supply by using its case, because that already has a hole and a huge fan and a carbon filter can easily be placed inside…

At least one switch is required to turn the fan on and off. That is if you ever like to enjoy light and silence altogether ;)

Kellerjoch, Schwaz/Tirol

Tue, 10 Oct 2017 18:50:53 +0200

it's a robot

Fri, 17 Feb 2017 16:14:34 +0100

A Wolfs Dream

Wed, 11 Jan 2017 00:25:06 +0100

Its ridiculous how bad I am in drawing. Because of that I started to learn Blender some years ago. One of my last drawings was a scene from a dream I once had. With Blender I was finally able to catch the mood of that scene in an image:

Charliecube

Tue, 13 Dec 2016 00:19:41 +0100

Again on lighting. This time it is a 4x4x4-LED-cube I had laying around for several month. Building such a thing takes a bit of patience, but turned out to be relaxing as playing with lego. Programming it can get challenging, but the software provided does a good job in simplifying it by providing graphics primitives.

parts and sources #

aglick.com original author,
thingiverse.com/thing:501651 printed parts/tools,
hackerspace-bielefeld.de software modifications,
sites.google.com/site/rgbledcubes pinout correction,
instructables.com/id/charliecube… hippynerd’s step-by-step instructions

why? #

Mainly I wanted to have one, because they look so great. On the other hand this is also an interesting project, because the exercise is to control 192 light emitting diodes (LEDs) with a single microcontroller.

Winterlight

Wed, 07 Dec 2016 22:59:26 +0100

Now that the dark season of the year is coming, I felt the need for a better lighting concept in my room. The blue light is meant to remind me on how the blue summer sky looks alike. I liked the blue energy saving lamps even better than its LED counterparts, because they deliver cooler light. The construction of the lamp is kept as simple as possible.

An IKEA PRÖJS desk pad forms the lamps body and acts as diffuser. It is held together with a punched metal strip and M3 nuts and bolds and 3M double sided tape, all of which I had lying around.

The new Server is doing a good job

Mon, 29 Aug 2016 23:24:57 +0200

Not only does it serve virtually 'everything' much faster, but is also highly configurable and therefor tweakable. I am really satisfied with the result. Besides from that I have also set up a system monitor and log file analyzer, which I haven't had for a while. But in order to deliver relevant content the importance of such tools should never be underestimated. I also have moved my voice mailbox from an old raspberry pi b+ to this server. This simplifies my backups, improves its reliability and as a bonus I do not have to deliver my voice mails across the internet or at least I don't have to let asterisk know any of my smtp passwords ;)

Migration sucessfull

Thu, 30 Jun 2016 03:21:34 +0200

I have moved my infrastructure to my own virtual server and now have a central point to administrate everything. Thanks to FreeBSD and it's jails I was able to separate services, which are known to have security issues regularly. Also I have already operated that server for two years and fine tuned many things, like firewall rules and kernel parameters. I am now pretty happy with the result. Among many other advantages which I gained by doing so, I have also improved the accessibility for my visitors: My sites are available over IPv6 and HTTPS, which tended to be too expensive on my previously used shared webspace. I am currently thinking about writing an article or creating a video about what I have learned about the differences and similarities between self hosted environments and shared webspace, because I managed to run unsupported code and languages on my shared space for years, which some of you may find interesting.

Blender: NES Console

Thu, 09 Jun 2016 01:12:08 +0200

poor mans null modem adapter

Sat, 20 Feb 2016 02:52:01 +0100

actually... it works :) ;)

interior furnishing with blender

Tue, 16 Feb 2016 17:10:26 +0100

first complete 360 degree rendering took 4 hours (without baking anything)

3,5"HDD disassembly time lapse

Sat, 09 Jan 2016 23:23:48 +0100

how to disassemble a 3,5" hard disk drive to salvage useful parts

qspacestatus

Thu, 03 Dec 2015 06:17:53 +0100

qspacestatus is a program to display the status (open/closed) of your hackerspace in the notification area. Source code and binaries for Linux and Windows are available for download, packages for different distributions will follow.

GIT repository now officially online!

Thu, 03 Dec 2015 06:15:19 +0100

My GIT repository is finally reachable via http://git.entwicklerseite.de/

qjackctl: new logo

Thu, 12 Nov 2015 10:23:23 +0100

My logo made it into the official build :)

I created it, because the old icon had only 32x32 pixels and looked ugly when scaled up. However I liked it and tried to keep mine close to the original.

see: http://qjackctl.sourceforge.net/

todays icon

Tue, 13 Oct 2015 03:56:22 +0200

NAS4Free

Wed, 19 Aug 2015 12:07:39 +0200

NAS4Free ist ein auf FreeBSD basierendes System, welches als Livesystem auf Dateiservern eingesetzt werden kann. Damit habe ich mich eine Zeit lang beschäftigt. Heute sehe ich, dass ein Forenbeitrag von mir mit Erwägungen zu passender Hardware und dem Umgang mit ZFS bereits 10000 Mal gelesen wurde.

Blender can now render anaglyph images :)

Sun, 14 Jun 2015 03:25:33 +0200

not bad as a first test

Universalstuhl von Heinz und Bodo Rasch

Sun, 07 Jun 2015 00:51:21 +0200

Because it is so hard to imagine how such a chair would be adjustible, here comes an animation:

In reality

Tue, 02 Jun 2015 17:03:30 +0200

Greenscreen: A first try

Wed, 13 May 2015 02:40:14 +0200

custom icon set

Mon, 27 Apr 2015 13:58:34 +0200

I am currently producing a custom icon theme. Work in progress:

Neue Webseite

Sat, 07 Mar 2015 13:15:29 +0100

Auftrag gemäß Kundenwunsch erledigt

Pilatus, Luzern

Thu, 18 Dec 2014 05:47:56 +0100

Invitation

Mon, 01 Dec 2014 17:48:06 +0100

10000b :: birthday - made with blender

Frankfurt: Willy-Brand-Platz

Mon, 06 Oct 2014 01:57:29 +0200

“little planet”-image of the european central bank in Frankfurt, Germany.

It is unfortunate, that I had to take the photo free handed, because I had no tripod with me. But the result is still decent, I think.

Justitia

Thu, 18 Sep 2014 14:40:51 +0200

Eine 212 Kilobyte große Gif-Datei als eye catcher für blog.malzeiten.de. Fotografiert mit Canon EOS 650D

Schuko plug and socket

Mon, 08 Sep 2014 00:58:46 +0200

Blendermodell einer Steckdosenleiste, gerendert mit cycles. Versionen mit und ohne Schalter/ Kann man ja immer mal gebrauchen sowas... ;)

LCDd extension: maxilcd

Thu, 04 Sep 2014 12:39:41 +0200

My LCDd extensions is a simple bash script and it integrates well with lcdproc. Nevertheless it displays things I missed in lcdproc:

ip-address
hostname
hard disk(s) temperatures
CPU utilization
CPU temperature (alias physical id 0)

Prerequirements #

Make sure, that LCDd is running. Your tools:
```
vim /etc/lcdd.conf
systemctl start lcdd
systemctl status lcdd
systemctl enable lcdd
```
If you see a permission denied error, then a restart helps for an unknown reason.

Hackerspace Bielefeld in 3D

Thu, 07 Aug 2014 21:48:21 +0200

Gerade bin ich dabei ein 3D-Modell von diesem etwas schrägen Gebäude herzustellen. Vielleicht demnächst als Level für einen Egoshooter oder zum Planen der Inneneinrichtung. Jedenfalls sieht es schonmal ganz cool aus und schmückt das Wiki vom HSB.

Solder fume extractor version 2.0

Mon, 17 Mar 2014 20:29:58 +0100

A 3D printer can sometimes be a substitute for a milling machine. That is now the second version, the first you see in the background.

Material #

Aktivkohlefilter (130x130mm)
120mm Gehäuselüfter -
Netzteil (12V)
Gehäuse aus PLA

Progress: 3D printer

Thu, 13 Mar 2014 12:45:31 +0100

Success! My do it youself 3D printer prints for the first time:

3D model of me (not scanned)

Fri, 24 Jan 2014 09:47:51 +0100

raspberry pi model

Thu, 23 Jan 2014 14:46:50 +0100

A game with geometry and solid surface modelling

vcf file normalization by email

Fri, 17 Jan 2014 01:27:34 +0100

This little perl file is to convert unique UIDs of VCards into mail=... which is where the claws mail program finds duplicates.

#!/usr/bin/perl

open(FILE, '2014-01-17.vcf');
my $content = join('', <FILE>);
close(FILE);

sub found()
{
        my $vcard = $1;
        if($vcard =~ /^EMAIL.*:(.+)rn/m)
        {
                my $mail = $1;
                $vcard =~ s/UID:.*/UID:mail=$mail\,ou=people\,dc=typesafe\,dc=de/g;
        }
        print qq[$vcardrnrn];

}
$content =~ s/(BEGIN:VCARD.*?END:VCARD)/found/gmes;

Windows 8 license allows surveillance

Wed, 02 Oct 2013 11:56:15 +0200

An important but yet often unnoticed paragraph in the Microsoft license of Windows 8: It is necessary to grant Microsoft access to personal data in order to install it. Some of these ‘features’ can be deactivated later on, but that does not make it any better for me.

Video: Bouldern im Speicher1

Sun, 06 May 2012 13:54:52 +0100

Blender

blender model of my room

Sun, 25 Mar 2012 01:13:27 +0100

My first blender model in scale

edged a pcb

Fri, 10 Dec 2010 03:40:45 +0100

I edged my first pcb for the alarm clock of my dreams :)

prototype: alarm clock

Tue, 16 Nov 2010 03:24:41 +0100

This is my first working prototype. It:

plays mp3 music from sd memory card,
shows status messages on an spi interfaced display,
communicates via rs-232,
receives and decodes the dcf-77 signal to drive a precise clock

rs-232

Tue, 21 Sep 2010 10:26:06 +0200

I got the RS-232 connection working. Nothing special, but from that helps a lot when debugging

HD44780 8bit init

Thu, 13 May 2010 18:09:20 +0200

I had success interfacing the HD44780 display

uC programming

Mon, 26 Apr 2010 23:26:01 +0200

Worth an entry: The first day I have ever programmed a µ-controller myself. My aim was to build a digital alarm clock and this led me directly into the world of digital electronics.

The biggest maze in the world

Tue, 23 May 1989 14:26:01 +0200

Drawn in my early school days. If your child does something like that, I suggest you support it becoming an electronic engineer or a programmer, like me.