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Comparison of RJ45 connectors Cat 5e, Cat 6 and Cat 6a
At first glance, all RJ-45 connectors look the same, regardless of category. However, in practice, there are significant design differences between them that affect connection quality, cable compatibility, and network signal stability. In this article, I have compared RJ-45 connectors… >>>
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Zabbix local network access only
Introduction Zabbix is a powerful monitoring system often used to track server health, network devices, and services. By default, after installation, the Zabbix web interface becomes available not only locally but also from the internet, which may pose a security… >>>
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How to Create an IP Blacklist on a Ubiquiti UniFi Gateway Using Zone-Based Firewall
Introduction After analyzing my Postfix server’s activity graph using Zabbix, I discovered that every 5 minutes, an attacker attempts brute-force login attempts. To prevent this, I decided to manually configure firewall rules and demonstrate how to create an IP blacklist… >>>
