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:
2025-08-14
Introduction: The First Line of Defense for Your Server
Before thinking about complex intrusion detection systems such as Fail2ban or CrowdSec, you need to build the first and most reliable line of defense—a firewall. A firewall controls all network traffic entering and leaving your server and blocks unauthorized connection attempts.
Traditionally, Linux servers have used iptables to manage firewalls, but its syntax can be complicated and confusing. Fortunately, there is a simpler and more intuitive tool — UFW (Uncomplicated Firewall).
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.
2025-07-29
Redundancy of Interoffice Links (Site-to-Site VPN, MPLS, Dark Fiber)
We’ve already discussed how to ensure reliable connectivity within a single building. Now let’s look at a more complex but equally critical topic: redundancy of communication links between geographically distributed offices or branches. This is crucial for companies where employees across locations need to exchange data, access shared resources (such as a central CRM, file servers, or IP telephony), and work as a unified whole.
2025-07-27
In today’s world, where every aspect of business depends on IT, and downtime is measured not only in lost revenue but also in missed opportunities and reputational damage, connection stability becomes a critically important factor. From email and internal CRMs to online sales and cloud services — all of it requires constant and reliable network access.
This is where network link redundancy comes into play. It’s not just “insurance” — it’s a fundamental part of your business continuity and high availability strategy for your IT infrastructure.
2025-07-21
Many thanks to Mikhail for the work, I am very pleased with the result. I especially thank him for the recommendations during the setup process — from my rather muddled brief (and I know little about servers) Mikhail, with clarifying questions and suggestions of his own, formulated a clear understanding of what tasks the final build will solve and how to organize everything in the best way. I recommend!
Reply: Thank you for the feedback!
Glad to help!
2025-07-17
In the world of networking, there’s often a need to bridge two remote LANs so they behave like a single local network—even when separated by different routers. For MikroTik users, the concept of EoIP (Ethernet over IP) is familiar: it’s a proprietary tunneling protocol that allows creation of a virtual Ethernet interface (Layer 2) over an IP network.
Good news for Keenetic users: since firmware NDMS v2.10, Keenetic routers also support EoIP! This opens up exciting possibilities for advanced network designs.
2025-07-15
In the world of Linux and networking technologies, there are many subtle but critically important kernel settings. One such setting is rp_filter. This parameter, often overlooked, plays a key role in network security and correct packet routing. Let’s explore what it is, how it works, and why understanding it is essential for every system administrator.
What is rp_filter?
rp_filter stands for Reverse Path Filtering. It’s a Linux kernel mechanism that checks incoming network packets to verify whether they arrived on the interface through which a reply to the sender’s IP address would be routed.
2025-07-11
Introduction: UniFi – An Ecosystem for Modern Networks
In the world of business networking, many solutions exist—but few offer the same level of integration, management simplicity, and aesthetics as the UniFi product line from American company Ubiquiti Networks. Unlike the more “bare-bones” approach of Mikrotik, UniFi is designed for building a unified, centrally managed ecosystem. This makes it especially appealing to small and medium-sized businesses that value not just performance, but also ease of deployment, monitoring, and scalability.
2025-07-10
Introduction: Mikrotik – More Than Just a Router
When it comes to networking hardware for home or small offices, most people think of consumer-grade routers like those from TP-Link, ASUS, or D-Link. However, there’s a category of devices offering far more flexibility, features, and control—while remaining affordable. We’re talking about Mikrotik, a Latvian company known for its wide range of networking gear, especially routers and switches.
What truly sets Mikrotik apart isn’t just the hardware, but its operating system — RouterOS. This powerful software transforms ordinary devices into versatile tools capable of handling tasks usually reserved for far more expensive enterprise solutions.
