Linux

Add a User to a Linux Group
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If you need to add an existing user to a Linux group it is very easy, just run the following command:

usermod -a -G <group name> <user name>

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Using iptables to route OpenVPN traffic
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To have your vpn traffic be able to reach the internet you just need to add the following iptable rules:

iptables -A FORWARD -i tun0 -j ACCEPT
iptables -A FORWARD -i tun0 -o eth0 -m state –state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i eth0 -o tun0 -m state –state RELATED,ESTABLISHED -j ACCEPT
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth0 -j MASQUERADE

This would take the tunnel adapter of tun0 and route the traffic through eth0 for the vpn subnet of 192.168.0.0.

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Maltrail – Malicious Traffic Detection System
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A malicious traffic detection system which can be deployed on your network with ease.

https://www.latesthackingnews.com/maltrail-malicious-traffic-detection-system/

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Linux: Keep An Eye On Your System With Glances Monitor
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This is a simple to install script which will make monitoring you system in real-time very easy.

 

Source: Linux: Keep An Eye On Your System With Glances Monitor

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Linux Command Line Cheat Sheet
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Linux Command Line Cheat Sheet

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