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We needed to find out why the site periodically goes down. Mikhail conducted an audit and found the problem. He's a competent specialist — a pleasure to work with. He approaches tasks responsibly, doesn't disappear or forget )))

2025-08-25

Needed to find out why the site was periodically crashing. Mikhail conducted an audit and found the problem. A knowledgeable specialist, I really enjoy working with him. He approaches tasks responsibly, doesn’t disappear, doesn’t forget )))


Reply: Thank you for the feedback! Glad to help!

084 | Keenetic: A Modern Router with Modular Architecture

2025-08-16

Keenetic: A Router Whose Main Asset Is Its Operating System

A Quick Look at Keenetic

In the world of home routers, where most devices come with proprietary, bloated firmware, Keenetic stands out with its unique approach. Instead of competing solely on hardware, the company focuses on its own operating system — KeeneticOS. This makes their devices not just routers, but flexible, stable, and expandable network platforms.

KeeneticOS: Modular and Reliable Core

Under the hood, Keenetic runs a Linux-based system topped with a unique modular operating system. This approach offers two key advantages that tech-savvy users will appreciate:

MTU Issue on reg.ru and Its Solution via iptables

2025-08-05


Introduction: A Hidden Network Issue

Developers and system administrators using servers on the OpenStack platform (for example, the C*-M*-D* hosting plans from reg.ru) sometimes encounter mysterious network problems. The internet seems to work, but when trying to transfer large amounts of data or establish connections to certain services, requests may hang or fail due to timeouts.

The provider explains this issue as a feature of their infrastructure:

Servers on the OpenStack platform use VxLAN technology, which reserves 50 bytes for service information. Because of this, the maximum transmission unit (MTU) on the server’s main network interface (ens3) is 1450 bytes.

073 | Introduction to Virtualization: Why It’s Needed and How It Saves Time

2025-08-04


What is Virtualization?

Virtualization is a technology that allows the creation of virtual versions of resources such as servers, operating systems, storage, or networks. It makes it possible to run multiple “virtual machines” (VMs) on a single physical server. Each VM operates as a fully independent computer with its own operating system and applications, while sharing the physical resources of the underlying hardware.

The key component of virtualization is the hypervisor. A hypervisor is software that creates and manages virtual machines, distributing the host machine’s physical resources (CPU time, RAM, disk space, and network interfaces) among them.

I want to express my immense gratitude to Mikhail for his work. There was an issue with the domain email on Yandex — Yandex and the hosting support were playing ping-pong, each blaming the other. Mikhail stepped in, diagnosed the problem, and fixed it quickly! Highly recommend!

2025-08-01

I want to express my huge gratitude to Mikhail for his work. There was a problem with domain email on Yandex. Yandex and the hosting support were playing ping-pong, passing the problem to each other. And Mikhail came in, saw it, and quickly solved the problem! I definitely recommend him!


Reply: Thank you for the review! Glad to help!