DoS Protection via APF, BFD, DDoS and Rootkit Detection

By admin • General

Protecting your Linux server from DoS attacks, brute force attempts, and rootkits is essential for maintaining server security. This guide covers APF, BFD, DDoS protection tools and rootkit detection.

APF (Advanced Policy Firewall)

APF is an iptables-based firewall with easy configuration. It provides policy-based filtering for both inbound and outbound traffic.

BFD (Brute Force Detection)

BFD is a modular shell script that works with APF to detect and block brute-force attacks against SSH, FTP, and other services.

# Install BFD
wget http://www.rfxn.com/downloads/bfd-current.tar.gz
tar -xzf bfd-current.tar.gz
cd bfd-*
./install.sh

DDoS Deflate

A lightweight bash script that detects and blocks IP addresses creating too many connections.

Rootkit Detection

Use rkhunter and chkrootkit to regularly scan for rootkits and backdoors.

rkhunter --check
chkrootkit