An interesting topic, which is practically not discussed, at least publicly: amateur radio networks.

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The article lists various DNS servers (Domain Name System, port 53/UDP).

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When running the ping command on Linux, a system error may occur. The reason is not obvious.

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The Ubuntu Linux operating system is generally free of bloatware. With the exception of the "ubuntu advantage tools" package, which Canonical began to distribute for Ubuntu and Linux Mint. Remove the unnecessary package.

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Using WireShark, we were able to capture two packets of the new CoAP network protocol.

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ОднOnce I had to give an employee a USB flash drive on which both programs and personal photos were stored. I deleted the photos, but they remained in the sectors and their employee could restore them if he wanted. Therefore, we need a way to clean up free disk space. I found a command on how to do this - it works with NTFS, FAT and EXT3 file systems. The command line program is called SFill.

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In recent days, when searching in Yandex, a floating window "- is this your account?
Not now
Enter ".
The window closes almost a third of the smartphone screen. Nowhere on the Internet I found a solution for how to remove it. Perhaps the problem is only for me. 😦 I give a solution to the problem.

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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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