New project: tcpblocker 1.0
Tcpblocker is for sites that want to limit the number of times an IP address
can connect to a tcpserver controlled service such as smtp. Each time
tcpblock runs, it counts how many connections were made per client IP. If an
IP exceeds the configurable, maximum number of connections within the
configurable time period, tcpblock outputs a standard deny line that can be
used to build a tcp.smtp style file.
Combined with a cron job and a run script, tcpblocker can be configured to fit
into just about any qmail or tcpserver installation.
Project page: http://www.inter7.com/?page=tcpblocker