Re: [syslog-ng] DNS-based port knocking demo

Endre Szabo <syslog-ng@end.re> writes:

Here's a proof of concept of DNS based port knocking. Firewall opens up port of SSHd for 10 seconds after nameserver answering to a predefined DNS query. It uses pattern db and netfilter only.

http://vimeo.com/endreszabo/dns-portknocking

This is seriously wicked. -- |8]