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Intelligently block brute-force attacks by aggregating system logs
SSHGuard protects hosts from brute-force attacks against SSH and other services. It aggregates system logs and blocks repeat offenders using several firewall backends, including iptables, ipfw, and pf.
using PHP (and some ShellScript) to protect your linux server against bruke force attacks(http://en.wikipedia.org/wiki/Brute_force_attack).
also keep a log in MySQL and have email reporting
Bruteblock allows system administrators to block various bruteforce attacks on UNIX services. The program analyzes system logs and adds attacker's IP into IPFW table effectively blocking them. Addresses are removed from the table after expiration period