(Updated version: http://gentoo-wiki.com/HOWTO_BlockHosts)

Protecting SSHd (and others) with BlockHosts

What is BlockHosts?

Blockhosts is a python script which records how many times a system service has been probed, using configurable pattern matching to recognize failed accesses (such as for "sshd" or "proftpd" or any service), and when a particular IP address exceeds a certain number of failed attempts that IP address is blocked by using one of the following techniques, e.g.:

• using TCP_WRAPPERS (writes to /etc/hosts.allow)
• using "ip route" commands to setup null-routing for attackers
• using IPtables to setup packet filtering for attackers

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