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GRE Tunnel Between Cisco and Linux
Generic Routing Encapsulation - GRE is a tunneling protocol originally developed by Cisco that encapsulates various network protocols inside virtual point-to-point tunnel. It transports multicast...
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GRE over IPSec Tunnel Between Cisco and VyOS
The previous tutorial shown GRE tunnel configuration between Cisco router and Linux Core. The big advantage of GRE protocol is that it encapsulates L3 and higher protocols inside the GRE tunnel so...
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Collecting MAC and IP Adresses of Hosts Connected to Cisco Switches Using SNMP
The goal of this article is to introduce a script that automates a process of collecting MAC and IP address of hosts connected to Cisco switches using Simple Network Management Protocol (SNMP). We will...
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BASH Script for Dictionary Attack Against SSH Server
Although they are several dictionary password attack tools available for Linux such as Hydra, Ncrack, I have decided to practice BASH scripting and write a script getsshpass.sh that can perform...
View ArticleSlovakia Wins Cyber Exercise Locked Shields 2016
Tallinn, April 22, 2016 - The team from Slovakia won Locked Shields 2016, the world’s largest and most advanced international live-fire cyber defence exercise. They were closely followed by the NCIRC...
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Forensic Lab Game Zero - Level 1 Results
The goal of the post is to provide solutions for the first level of the game for "hackers" created by forensic lab of CESNET association. With this game CESNET introduces a work of forensic analysts...
View ArticleForensic Lab Game Zero - Level 2 Results
Below are my solutions to the level 2 of the forensics lab game zero. The solutions to the level 1 of the game are posted here. 1. Find way to reset root's account password and retrieve flag from...
View ArticleForensics Challenge for CSIRT Team - Part 1 Assignment
I have created a virtual machine that you can use to test your forensics analysis skills. Please, download the VM, solve an assignment below and share solutions with us. 1. Assignment Your are a member...
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Forensics Challenge for CSIRT Team - Part 2 Solution
The goal of the tutorial is to provide a solution to the forensic challenge game that I created for testing forensic skills of CSIRT team. Please be careful and run a suspicious binary file located...
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Quagga Routing Software with EIGRP Support
In May 2013, Cisco opened its proprietary EIGRP protocol and released an informational RFC 7868 - Cisco's Enhanced Interior Gateway Routing Protocol (EIGRP). It gives other vendors an opportunity to...
View ArticleUsing Rsync to Copy Files From SSH Server
Recently I have come through an interesting problem. I needed to download a raw copy of the HDD image located on a remote server (about 180GB) connected via 1 Mbps link. Network connection dropped...
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Clonezilla Server Edition Installation on Ubuntu
The tutorial describes installation steps for Clonezilla Server Edition (SE) on Ubuntu 16.04.1 LTS using a Bash script. Clonezilla is OpenSource Cloning System (OCS) and it is a partition and disk...
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Hacking DRBL Client PXE Boot Password
In a previous tutorial I showed installation of Clonezilla Server Edition on Ubuntu using my own Bash script. We configured PXE (Pre eXecution Environment)) password for clients so when the clients...
View ArticleScripts
This article contains a list of scripts that I created and that are somehow useful for me. You are free to download and modify them according to your needs. I do not take any responsibility for...
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GRE over IPSec Tunnel and NAT Between Cisco and VyOS
The goal of this tutorial is to provide a configuration for Cisco and VyOS network devices with configured PAT (Port Address Translation) that connect two remote sides A and B through point-to-point...
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Bash Script for Converting Video To MP3 Audio
I like listening to video training on my smartphone while walking to work. To save the space on the memory card I convert videos to MP3 audio in advance. For this purpose I wrote a Bash script...
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Reverese Shell on Linux
Reverse shell is technique when a client connects to a server and the client provides its shell to the server. Clients is typically a host hidden behind the NAT or a firewall having an access to the...
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Syslog-ng Configuration For Newbies
Some time ago I was asked by my friend to recommend a cost-free solution that he could use for storing logs of his security device over network. The Linux OS with installed syslog-ng is perfectly...
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OpenSwitch Network Operating System
The Open Network Install Environment (ONIE) is an open source install environment that gives a switch user a choice to download ONIE compliant Network Operation System (NOS) to bare metal network...
View ArticleDownloading YouTube Videos From Links Saved In Google Chrome Bookmarks
The Bash script youtube-bookmarks-mp3.sh is using Python youtube-dl script along with ffmpeg in order to download videos from YouTube service. It also enables youtube-dl to convert videos to mp3 audio...
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