Protect your Linux server against malware and rootkits. rkhunter and ClamAV installation, scan configuration, result interpretation, scheduled scans, and incident response guide.
Protect your server against SSH brute-force attacks with Fail2Ban. Installation, jail.local configuration, Nginx/Apache jails, IP whitelisting, ban monitoring, and email alerts.
Set up a WireGuard VPN server: key generation, server and client configuration, IP forwarding, firewall rules, and Windows/Linux/Android client setup guide.
Zero Trust network security principles and practical implementation: never trust always verify, micro-segmentation, identity-based access, and implementation with existing Linux tools.
Set up two-factor authentication (2FA) for SSH access. Google Authenticator PAM module, TOTP setup for SSH, backup codes, testing, and troubleshooting guide.
Comprehensive comparison of iptables and nftables, nftables syntax, migration guide, common rule equivalents, and when to use which firewall tool.
NAT concepts, DNAT/SNAT rules, port forwarding with iptables and nftables, masquerading, and use cases: game servers, web servers behind NAT.
10 essential steps to secure a Linux server: SSH key authentication, firewall, Fail2ban, automatic updates, DDoS protection and more. A guide with commands and explanations.