Practicar Red Hat en mini labs

 https://lab.redhat.com/

Open Source Intrusion Prevention System

 https://www.snort.org/

Linux IPtables examples

 https://www.cyberciti.biz/tips/linux-iptables-examples.html/

Metasploit

 https://www.metasploit.com/

 

https://help.rapid7.com/metasploit/Content/home.html

Kali Linux download

https://www.kali.org/get-kali/