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Ipfixprobe Installation and Testing

Ipfixprobe is a project created by CESNET. CESNET is an association of universities and the […]

The post Ipfixprobe Installation and Testing first appeared on Brezular's Blog.

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Mikrotik RouterOS Upgrade from Version 6 to 7

The purpose of this guide is to provide a procedure that you can use to upgrade the RouterOS system (packages) and firmware (bootloader) from version 6 to version 7. If you already have a RouterOS version 6 system, upgrading to the latest version 7 is really easy and can be done from CLI. First, we […]
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Mikrotik RouterOS Upgrade from Version 6 to 7

The purpose of this guide is to provide a procedure that you can use to […]

The post Mikrotik RouterOS Upgrade from Version 6 to 7 first appeared on Brezular's Blog.

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Nprobe Layer 7 Application Visibility and Optional Plugins

Nprobe includes both a NetFlow v5/v9/IPFIX probe and collector. In a probe mode, nProbe captures packets on an interface and exports flows to a flow collector (Noction Flow Analyzer, Ntop etc.). If configured in a collector mode, it collects flows from other device such as routers/switches and export them via TCP streaming to Syslog, Splunk […]
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Nprobe Layer 7 Application Visibility and Optional Plugins

Nprobe includes both a NetFlow v5/v9/IPFIX probe and collector. In a probe mode, nProbe captures […]

The post Nprobe Layer 7 Application Visibility and Optional Plugins first appeared on Brezular's Blog.

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Noction Flow Analyzer – Post-install Steps and New Features Testing

The purpose of this guide is to discuss the next steps after installing Noction Flow Analyzer (NFA) on Ubuntu Linux. In addition, we will test some of the new features available in the latest version 21.11.0. Let's start where the previous article on installing NFA ended. We have our NFA version 21.10.0 installed on Ubuntu […]
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Noction Flow Analyzer – Post-install Steps and New Features Testing

The purpose of this guide is to discuss the next steps after installing Noction Flow […]

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Noction Flow Analyzer – Initial Setup in Home Lab

The goal of this guide is to create a minimalistic and virtualized laboratory infrastructure in a home environment so that everyone can become familiar with all the features that the Noction Flow Analyzer (NFA) provides before actually deploying the NFA in the enterprise network. Our home network consists of two key components - nProbe Pro […]
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Collect hashes from remote computers

I was recently asked to create a script that should calculate the hash values of all files on remote computers. The collection must be done in parallel on all computers.  My choice fell on Bash because it allows to quickly collect hashes using a combination of SSH, sshpass, find and hash (coreutils package). The collect_hashes.sh script […]
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Wi-Fi 5 Vs. Wi-Fi 6

Wi-Fi 6 also known as 802.11ax is the latest generation of 802.11 WiFi standard and the successor of Wi-Fi 5 aka 802.11ac. Wi-Fi 6 increases user throughput by more efficient spectrum usage, provides larger signal coverage and reduces the power consumption. In the following section, we will discuss the significant improvements of Wi-Fi 6 over […]
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MikroTik RouterOS Advanced Configuration

In the previous tutorial, we installed and configured a brand new MikroTik hAP ac³ router for connection to the Internet. We also improved the overall security of the router by implementing simple steps to harden it. These include things like disabling unused services, enabling HTTPS for device management, updating RouterOS, and reconfiguring the firewall rules. […]
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Initial Setup of MikroTik hAP ac³ Router

This tutorial will help you install and configure the MikroTik hAP ac³ dual-band wireless router for home use. In terms of hardware, the router is an excellent device offerening 5 Gigabit Ethernet ports and has two high gain wireless antennas with outstanding coverage. Operating system - RouterOS is preinstalled and licensed (Layer 4) which never […]
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Cracking WPA/WPA2 Pre-shared Key Using GPU

The WPA/WPA2 4-way authentication handshake between AP (authenticator) and client (supplicant) is used to generate encryption keys. These keys are then used to encrypt data sent over wireless medium. In the previous tutorial, we installed the aircrack-ng suite to capture and crack the 4-way authentication handshake to obtain passphrase needed to access a wireless network. […]
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VyControl Installation on Standalone VyOS Router

So far, we have discussed both the manual and Docker methods of installing VyControl. The manual method consists of cloning the VyOS git repository and installing Python dependencies in a virtual environment. The Docker method is based on downloding VyControl Docker image from Docker hub and launching the container. In both cases, VyOS controller is […]
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VyControl – Web UI for VyOS Firewall

VyControl project is a single frontend interface to manage a single or multiple VyoS servers. It was developed by Roberto Berto and is written in Django/Python. It currently supports firewall and static routes configuration. Additional features are planned such as IPSEC, openvpn and basic dynamic routing. My goal is to provide easy-to-reproduce installation steps so […]
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Docker Installation on VyOS

Docker really makes it easier to create, deploy, and run applications by using containers, and containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and ship it all out as one package [1]. I would like to share the script vyos-docker-install.sh, which […]
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Cracking WPA/WPA2 Pre-shared Key

This tutorial illustrates cracking of pre-shared key which is needed to gain an access to a WPA/WPA2 network. Instead of explaining the theory behind the attack, I focus on providing commands that you can easily copy and paste and penetrate the network. However, I strongly recommend getting a background to this topic by studying online […]
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Fence Rail Transposition and Caesar Ciphers in Python

Recently I wrote simple encryption and decryption programs in Python to practice my coding skills. The first cipher_encrypt utility takes the clear_text.txt file as input. It first capitalizes all letters and then encrypts the text with the Rail fence cipher. The number of rows can be set using the variable k. The result of the […]
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Playing with Python Ransomware

I recently came across the Python script pokus.py which implements a ransomware function. The code is written for demonstration purposes only, so it completely lacks obfuscation techniques. The goal is to identify the vulnerability that is intentionally implemented in the code so we can restore the attached file - private.gif.rsw (the file is compressed by […]
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Remotely Triggered Black Hole Filtering as Service

Remotely triggered black hole (RTBH) filtering is a technique that provides the ability to drop undesirable traffic before it enters a protected network. It is commonly used for the mitigation of distributed-denial-of-service (DDoS) and DoS attacks. We have covered a configuration of source and destination RTBH for Cisco IOS-XR in a previous tutorial. A trigger […]
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