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Ethernet, FTP, Telnet, HTTP, Bluetooth — the basics of traffic analysis. Solving network tasks with r0от-мi. Part 1

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In this article, we will explore the first 5 tasks and learn the basics of traffic analysis for various network protocols. Organizational InformationEspecially for those who want to learn something new and grow in any area of information and computer security, I will be writing and sharing about the following categories: PWN; cryptography (Crypto); network technologies (Network); reverse (Reverse Engineering); steganography (Stegano); search and exploitation of WEB vulnerabilities. […]

How a decentralized messenger works on blockchain

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In early 2017, we began creating a blockchain messenger [the name and link are in the profile] by discussing its advantages over classic P2P messengers. 2.5 years have passed, and we have managed to validate our concept: messenger applications are now available for iOS, Web PWA, Windows, GNU/Linux, Mac OS, and Android. Today, we will share how the blockchain messenger works and how client […]

Cron in Linux: History, Usage, and Structure

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A classic once wrote that happy people do not count the hours. In those wild times, there were neither programmers nor Unix, but nowadays programmers know for sure: instead, cron will keep track of time for them. Command-line utilities are both my weakness and my routine. sed, awk, wc, cut, and other old programs are run by scripts on our servers daily. Many […]

"Anonymized data" or what is planned in Federal Law 152.

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A brief excerpt from the draft law amending Federal Law No. 152-FZ dated July 27, 2006, "On Personal Data" (152-FZ). With these amendments, 152-FZ will "allow trading" Big Data and strengthen the rights of personal data operators. Readers may find it interesting to focus on key points. For a detailed analysis, it is recommended to read the original source. As noted in the explanatory memorandum: The draft law was developed […]

Cisco Training 200-125 CCNA v3.0. Day 44. Introduction to OSPF

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Today, we will begin our study of routing using the OSPF protocol. This topic, along with the review of the EIGRP protocol, is one of the most important in the entire CCNA course. As you can see, section 2.4 is titled "Configuration, verification, and troubleshooting of single-area and multi-area OSPFv2 for IPv4 (excluding authentication, filtering, manual route summarization, redistribution, stub areas, virtual links, and LSA)." The OSPF topic is quite […]

A simple and safe way to automate canary deployments using Helm

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Canary deployment is a very effective method for testing new code on a subset of users. It significantly reduces the traffic load that might cause issues during the rollout, as it only occurs within a specific subgroup. This note is dedicated to how to organize such a deployment using Kubernetes and deployment automation. It is assumed that you have some knowledge of Helm and […]

How to Properly Configure SNI in Zimbra OSE?

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At the beginning of the 21st century, a resource such as IPv4 addresses was on the verge of exhaustion. As early as 2011, the IANA allocated the last five remaining /8 blocks from its address space to regional internet registries, and by 2017, they ran out of addresses as well. The catastrophic shortage of IPv4 addresses led not only to the emergence of the IPv6 protocol but also to the SNI technology, which […]

Unboxing the Cisco UCS C240 M5 rack server

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Today, we have a new rack server, the Cisco UCS C240 fifth generation, on the table. What makes this Cisco server particularly interesting for unboxing, considering that this is already its fifth generation? Firstly, Cisco servers now support the latest generation of Intel Scalable processors, second generation. Secondly, Optane Memory modules can now be installed for using multiple NVMe drives.

Creating a Home Library with Notion and Python

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I've always been curious about how to better organize the books in my e-library. Ultimately, I arrived at a solution with automatic page count and other perks. I invite everyone interested to read more. Part 1. Dropbox All my books are stored in Dropbox. There are four categories into which I divided everything: Textbook, Reference, Fiction, Non-fiction. […]

Kubernetes 1.16 – how to upgrade without breaking anything.

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Today, September 18th, the new version of Kubernetes — 1.16 is being released. As always, we anticipate many improvements and innovations. However, I would like to draw your attention to the Action Required sections in the CHANGELOG-1.16.md file. These sections announce changes that may break your application's functionality, cluster maintenance tools, or require modifications to configuration files. In general, they require […]

Monitoring postgres inside Openshift

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Good day, Habr residents! Today I want to tell you about how we were eager to monitor Postgres and a couple of entities within the OpenShift cluster, and how we accomplished that. Initially, we had: OpenShift Helm Prometheus. Working with the Java application was quite straightforward and transparent. To be more precise: 1) Adding implementation to build.gradle ‘io.micrometer:micrometer-registry-prometheus’ […]

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