Category: complicado

every user want’s a fast & responsive internet. There is nothing more anoying than slow loading websites or other services that respond slowly or not at all (timeout) when the user needs them. DNS aka “the phone book of the […]

short story: phase it out So it finally happened, Oracle wants to cash in on it’s $7.4 Billion investment it made in 2009. The non-Open-Source non-GPL non-Free-Software-coffee has officially gone sour. One can just pray, that this will be a […]

“floating point arithmetic is considered an esoteric subject by many people” (src: What Every Computer Scientist Should Know About Floating Point Arithmetic – David Goldberg 1991.pdf) some even do “transcendental calculations” (src) make no mistake: computer make mistakes too! not […]

first some praise: the maintainers of grub did their best they could to bring about a great piece of software, no doubt about that. the question is: could less be more? when Greg Kroah-Hartman suggested to get rid of the […]

second take on trying to get a xmpp server (OpenFire, Java) client (Pidgin, C (C#, Perl, Python, Tcl are used for plugins)) up and running. at least this time with partial luck (was able to login via pidgin) but it […]

setup LAMP Linux Apache2 MariaDB PHP7.3 su – root; # become root apt update; # update system to latest apt upgrade; # database first apt install mariadb-server mariadb-client # set root pwd for database (can be root on dev test […]

As with all hot debated topics: Linus Torvald’s “show me the source” in this case, the source of one’s informations (always give the source!) is IMPORTANT for the information’s credibility. It is absolutely vital in science to give all sources […]

# become root su – root; # rpm based yum install nmap # apt based apt install nmap # find snmp enabled devices # (UDP port 161, can not be tested with telnet (can only do TCP)) nmap -sU -p […]

short version: + D1 Masten nicht überbucht/gute Netzqualität bei Nutzung von LTE (muss Handy können, kostet 5€ extra d.h. für 25€ monatlich (Stand: 2020-01) kann man dann tatsächlich sein Handy auch nutzen (falls dieses kein LTE kann… sollte man das […]

ONLY BUY FROM HARDWARE VENDORS THAT SUPPORT FREE & OPEN SOURCE SOFTWARE! (release the sources for their drivers and documentation for their hardware) “Currently there are only a few modern wifi chipsets readily available that work with free software systems. […]

bc is a nice calculator that one can use under linux terminal. a good exercise: count from 0 to 255 and convert it to binary # install # debian/ubuntu apt install bc # fedora/redhat/centos yum install bc # run bc […]

Why is quantum computing important: optimization Update: Google claims to have reached quantum supremacy The tech giant unveiled its x-quantum computer chip Bristlecone in March 2018 (src: cnet) original nasa paper: https://drive.google.com/file/d/19lv8p1fB47z1pEZVlfDXhop082Lc-kdD/view book: https://deepai.org/machine-learning/researcher/eleanor-g-rieffel https://www.amazon.com/Quantum-Computing-Introduction-Engineering-Computation/dp/0262015064 Scott’s Supreme Quantum Supremacy FAQ! […]

Warum VoIP? Viele Anbieter von LTE z.B. bieten gar keine Festnetz-Telefonie an, sondern nur Internet. (das zum Teil (nicht günstiger) aber schneller (und schnurloser via Handy-Netz) als die Telekom (4G/LTE/UMTS)). D.h. man braucht dann noch einen weiteren Anbieter der die […]

tested on: Operating System: CentOS Linux 7 (Core) CPE OS Name: cpe:/o:centos:centos:7 Kernel: Linux 4.15.9 Architecture: x86-64 # using vboxmanage –version 5.2.6r120293 ah lovely isn’t it? BSOD Win98 style… errors were NOT the exception, they were THE NORM (and still […]

Update: Article13 for North Stream 2 pipeline between Germany and Russia Mrs Reda (one of the last honest politicians out there, used to be in Pirate Party but now even advises to vote against it, because also in the Pirate […]

Der Tariff-Jungle der DHL ist NICHT MEHR ÜBERSCHAUBAR. Ich war heute mit 4x Paketen in der Filiale, zwei davon seien FALSCH frankiert gewesen, ich musste bei einem Paket 2€ nachzahlen, d.h. 7€ für ein Paket mit Sendungsverfolgung. Das andere sei […]

We all want RELIABLE technology to serve mankind – not pollute the planet and the oceans. For this to play out right – it is important to ONLY buy HIQH QUALITY products – that are hopefully manufacturerd IN YOUR COUNTRY […]

“Thinking is hard work and not worth the effort” (The Love Police) Ever wondered why WhatsApp is for free? It is a self-surveillance tool. Phones with closed-source wifi drivers are cheap. Because to know the last detail about you – […]

“You will constantly have to fight for even the most basic of rights – and build your own infrastructure – or your government will spy on you and lobbyists try to take away your freedoms.” Watch this video and this: […]

TOS-based systems (Atari ST) used a row of bombs to indicate a critical system error. Number of bombs displayed revealed information about the error. The error (also called an exception) is reported by the Motorola 68000 microprocessor. The very first […]

update: safety first! when it comes to important files: safety comes first thus recommend to the user that wants to go pro the following backup system: have two complete backups at two different places: backupA: at the company, USB 3.0 […]

while test running debian linux journald uses almost 100% cpu… “The daemon will implicitly collect numerous metadata fields for each log messages in a secure and unfakeable way. See systemd.journal-fields(7) for more information about the collected metadata.” https://www.freedesktop.org/software/systemd/man/systemd-journald.service.html systemd: Using […]

if you are using an MBR partition table then it’s stored in the drive MBR, if you are using GPT with BIOS then it’s stored in the drive’s protected MBR if you are using GPT with UEFI then it’s stored […]

update: 2020-09: problems getting bigger without regular updates because a SmartPhone (no matter Android/Samsung or IOS/Apple based) are essentially complete “notebook computers” with a very very small form factor directly or NAT (NAT better to avoid direct attacks, but no […]