Category: Linux

All about Network Security in Linux!

Hardening, Linux

Linux Users Hardening & Security Script

Tested on Debian 9.x Set Maximum number of days a password may be used sed -i "s/^PASS_MAX_DAYS.*/PASS_MAX_DAYS 90/" /etc/login.defssed -i "s/^PASS_MAX_DAYS.*/PASS_MAX_DAYS 90/" /etc/login.defs Set Minimum number of days allowed between password changes to 5 sed -i "s/^PASS_MIN_DAYS.*/PASS_MIN_DAYS 5/" /etc/login.defssed -i "s/^PASS_MIN_DAYS.*/PASS_MIN_DAYS 5/" /etc/login.defs Set Number of days warning given before a password expires sed …

Debian, Linux

Sublime editor on Debian

Installation sudo dpkg -i sublime-text_build-xxxx_amd64.debsudo dpkg -i sublime-text_build-xxxx_amd64.deb Dracula Theme Preferences -> Color Scheme -> Dracula Color Scheme -> Dracula CamingoCode Font sudo cp -r /home/username/Downloads/camingocode /usr/local/share/ sudo fc-cache -fvsudo cp -r /home/username/Downloads/camingocode /usr/local/share/ sudo fc-cache -fv Restart sublime if it is already open. Preferences -> Settings -> { "color_scheme": "Packages/Dracula Color …


OpenSSH server installation

To install the OpenSSH server application on your Ubuntu server system: Installation sudo apt-get install openssh-serversudo apt-get install openssh-server Backup original configuration file sudo cp / etc/ssh/sshd_config / etc/ssh/sshd_config.originalsudo cp / etc/ssh/sshd_config / etc/ssh/sshd_config.original sudo chmod a-w / etc/ssh/sshd_config.originalsudo chmod a-w / etc/ssh/sshd_config.original Generate SSH keys During the process you will be prompted for a …


shimmer – port knocking alternative

In computer networking, port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports. Once a correct sequence of connection attempts is received, the firewall rules are dynamically modified to allow the host which sent the connection attempts to connect over specific …

Linux, Monitoring, Network

Free Network monitoring tools

Nagios Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes. Designed with scalability and flexibility in mind, Nagios gives you the peace of mind that comes from knowing your organization’s business processes won’t be affected by unknown outages. Nagios is a powerful …

General, Linux, Programming, Ubuntu

First Official Pro Linux Laptop Released!

First official pro notebook that is released with Linux: DELL XPS 13, Developers Edition. Enjoy Ubuntu 12.04 LTS on up to 8GB RAM, 256GB SSD HD, full HD 1080p display on less than 1.40kg. Congrats to DELL for stepping forward on offering the Linux world to the IT/Engineering-Pro world with such nice specs!

Linux, Monitor, Network

Monitoring Opened TCP/IP network ports/connections in Linux

tcptrack displays the status of TCP connections that it sees on a given network interface. tcptrack monitors their state and displays information such as state, source/destination addresses and bandwidth usage in a sorted, updated list very much like the top command. The filter expression is a standard pcap filter expression (identical to the expressions used …