In a TP-Link network router ("router") with OpenWrt firmware, it was necessary to block the MAC address of the network device on the local network so that the device would not have access to the Internet.

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Task: upload photos via Wi-Fi from a smartphone to a personal computer running Linux.

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In a large network with DHCP enabled, intrusions sometimes occur - third-party connections.
They need to be tracked. It is convenient to take pictures of the network - before and after.
In the article I talk about two ways to compile a list of computers (a network snapshot) - using nmap and arp-scan.

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To search for rare countries or simply monitor activity on bands, DX clusters operating via the Telnet protocol are traditionally used. The advantage is low traffic consumption and low system requirements. The disadvantage is control using console commands and the lack of a graphical user interface. I found a successful solution that combines the advantages of a Telnet cluster and a graphical shell - a program from VE7CC.

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APRS over TCP-IP (over the Internet) is very easy to set up.

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The system time zone is selected when installing the distribution. In the future, you can configure time synchronization (NTP protocol) for more accurate time and organize the display of information about other time zones. For example, when it is morning in Moscow, it is deep night in the central part of the United States. This article is about how to improve time synchronization, set the time zone and display the time of other time zones on the screen.

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A few years ago I learned CW (Morse code). Now I want to increase the speed after a long break, because soon there will be competitions on ultra-short waves. I am publishing a script that I developed for training telegraph reception by ear. The script plays random text through the computer speaker at a specified speed.

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The Web utility PHPMYADMIN is used by the software developers to create and modify MySQL databases. After a few years of using this program, in connection with the transition to the newer MySQL 5.7.30 and PHP 7.2, it was necessary to update the phpmyadmin until the latest version ...

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It is difficult to work on satellites without using Doppler effect compensation. After all, during a flight, the reception frequency changes, especially quickly in the middle of the orbit.

There are two ways to compensate for frequency changes due to the Doppler effect - manually, using two independent transceivers (or one with Duplex function) and automatically using programs such as GPredict, SATPC32 or Orbitron.

In this article I will try to set up automatic correction of transmitting and receiving frequencies in Linux.

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In order to transfer files from a smartphone to a personal computer or output sound from a PC to a Bluetooth speaker or headphones, you need to connect the Bluetooth USB adapter to the computer, turn on and configure Bluetooth. This article is about how to enable Bluetooth in Linux.

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