Vyacheslav, Автор в IT Blog

PING3. Configuration and monitoring

I configured the PING3 remote monitoring device and wrote a zabbix template.

Zabbix: Monitoring Unread Emails

Voicemail messages were arriving in the VoiceMail subfolder of the Inbox, which operators were supposed to listen to and respond to user requests, but sometimes no one read them, so it became necessary to monitor the number of unread emails.

Zabbix: Monitoring Directory Permission Changes

Let’s say you’ve specified the rights and owner for a specific directory and want to ensure no one changes them. To do this, we’ll monitor it using Zabbix-agent.

Connecting Huawei ESM-48100B1 to ETP4860-B1A2 (SMU11B)

This time I connected the Lifepo4 battery Huawei ESM-48100B1 48V to the Huawei ETP4860-B1A2 with the SMU11B monitoring module and configured it.

How Kyivstar deceives and profits from its customers

One user once told me that he received an SMS on his phone with a message stating that the subscription fee for a daily package had been charged instead of a monthly one, although there was money in the account to charge the monthly one.

File Integrity Check Script (size+mtime)

I recently showed an example of a file integrity check script that calculates SHA-256 hashes. However, if the files are large and 100 gigabytes or more, this will naturally put a significant load on the disk system. Therefore, if this is critical and slows down other processes, I will give an example of a simple script that works much faster. It simply checks the file size and mtime (modification time). However, it is worth considering that, unlike the SHA-256 hash, an attacker can specify the mtime of a new, substituted, infected file similar to the old one.

Resetting the Foxgate S6224-S2

As an example, I will reset the settings on the L2 switch Foxgate S6224-S2.

Setting up Cloudflare proxy

Even with a free plan, Cloudflare proxy allows you to filter some bot traffic, especially if you enable Bot Fight mode and other security and vulnerability blocking features. Cloudflare proxy also allows you to hide the real IP address of your web server.

Setting up open_basedir

I strongly recommend configuring the open_basedir parameter, which lists directories beyond which PHP scripts cannot traverse, as open_basedir is not specified by default.
If open_basedir is not specified on the web server, then, for example, Path Traversal vulnerabilities can lead to access to all files on the server that have “read by others” permissions, such as /etc/, /var/, and other directories.

How to connect WiFi to a Deye inverter

I’ll describe the process of connecting a WiFi logger to the Internet.