Iptables
Packet Filter
Snort
Create a PKI
Guide on setting up a Public Key Infrastructure (PKI) for creating, managing, and distributing …
Banners: Hiding Application Banners (Service Banner Faking)
A guide to hiding service banners and modifying version information to improve security by making it …
Rinetd: Simply and Quickly Forward to Other Machines
A guide on how to use Rinetd to set up TCP forwarding between machines without complex firewall …
Stunnel: Creating an SSL Tunnel
A guide on how to set up and configure Stunnel to create secure SSL tunnels for services that don't …
Rkhunter: Detection of rootkits and malware
This article explains how to use Rkhunter to detect rootkits, backdoors and malware on Unix systems …