How to fix Yosemite wifi macbook problems

Two days ago I updated my Macbook Air (mid 2011) to the new Apple’s operating system called with the ugly name of Yosemite. Since then, my wifi connection is unstable. I am experiencing random disconnections and also the speed is tremendously slower than before. In some case I needed to reboot the Macbook in order […]

Continue Reading posted on November 2, 2014 21:38 | Comments { 0 }

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How to encrypt and decrypt files with OpenSSL toolkit

Do you remember the quote from LoTR, when Gandalf says: “Is it secret? Is it safe?” and next to that Frodo reveals the One ring which is inside a mail/letter. – Well, Gandalf I must say sir, this is no fucking secret and it’s no fucking safe. And yes, it’s wonderful to see you too […]

Continue Reading posted on October 20, 2014 22:34 | Comments { 0 }

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How to change kernel max PID number

The theoretical maximum PID number is 32768 for 32-bit and 4194304 for 64 bit . To get this information type: cat /proc/sys/kernel/pid_max or sysctl kernel.pid_max To change thins number, let’s say up to 100000, type: sysctl -w kernel.pid_max=100000 or, either writing directly to the file: echo 100000 > /proc/sys/kernel/pid_max Notice that, if your system is […]

Continue Reading posted on October 15, 2014 00:51 | Comments { 0 }

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Systemd – welcome to the D side of services

A server needs to provide some services (SSH, FTP, HTTP, etc) to its hosts/clients. Linux runs in servers, so Linux has to provide some services too. More specifically, Linux dominates in the server world. Therefore, in Linux, the concept of services is very important. So, what’s a service? In common language: It is something provided […]

Continue Reading posted on October 12, 2014 16:47 | Comments { 1 }


How to setup DD-WRT, DynDNS, SSH, SFTP, OpenVPN, miniDLNA, Samba, Transmission, RPi-Monitor using Raspberry-Pi

Download Raspbian image You are free to install whatever operating you want into Raspberry Pi, however I chose Raspbian, so does this guide. To download your preferable flavor of Linux, go at  I prefer the “Download Torrent” option, because it’s way faster that the direct download from their servers. Once the the download is completed, […]

Continue Reading posted on September 14, 2014 21:54 | Comments { 2 }

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I’ve installed Kali Linux. So what’s next?

Login as root (it is the only available account just after the Kali Linux finishes its installation). It would be now the time to download any updates, bug fixes or/and security patches for applications and the operating system. To do this, we start off by refreshing the repositories: apt-get update Move on and apply the […]

Continue Reading posted on May 8, 2014 07:14 | Comments { 0 }


Hex binary decimal converter 101

Take this number:  343 What’s this number? You think it’s decimal by default, right? However, the truth is, we can’t be sure. We can say that 3 is the MSB (most significant bit) and we end at 3 (LSB) the less significant bit. We start counting from the Zero position. Zero has a value, the […]

Continue Reading posted on April 10, 2014 11:43 | Comments { 0 }

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Network Security and Solutions

Network Threats Network security is an integral part of computer networking, regardless of whether the network is limited to a home environment with a single connection to the Internet, or as large as a corporation with thousands of users. The network security implemented must take into account the environment, as well as the tools and […]

Continue Reading posted on March 30, 2014 17:17 | Comments { 0 }


Did you know that Ethernet used to be proprietary protocol?

Ethernet was a protocol originally developed by Bob Metcalfe at the XEROX Palo Alto Research Center (PARC) in the 1970s. In 1979, Bob Metcalfe formed his own company, 3COM, and worked with Digital Equipment Corporation (DEC), Intel, and Xerox to promote the “DIX” standard for Ethernet. In 1985, the Institute of Electrical and Electronics Engineers […]

Continue Reading posted on March 18, 2014 19:07 | Comments { 0 }


Ask Ubuntu questions python script

Ah, it’s almost 9:00 and I am still awake. I’ve been trying to figure out how great it’s the howdoi and what if I could modify the script to work along with How it works Just type your question (query or just a phrase) or anything like being in Google, but in terminal. chmod […]

Continue Reading posted on January 5, 2014 10:03 | Comments { 0 }

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