Denyhosts vs Shorewall

Denyhosts

Security & Privacy

DenyHosts is an open-source program designed to help system administrators thwart SSH server attacks by blocking IP addresses using failed authentication attempts to detect attackers. It adds IP addresses to the system's /etc/hosts.deny file when it identifies too many failed SSH attempts.

Shorewall

Network & Admin

Shorewall is an open source firewall configuration tool for Linux operating systems. It provides a command-line interface and configuration files to easily set up Netfilter rules, interfaces, zones, and other common firewall components.