Sentry can detects and prevents bruteforce attacks against sshd using minimal system resources. Synopsis: sentry --ip=N.N.N.N [ --connect | --blacklist | --whitelist | --delist ] sentry --report [--verbose --ip=N.N.N.N ] sentry --help sentry --update Safe To prevent inadvertant lockouts, Sentry manages a whitelist of IPs that have connected more than 3 times…