Knockd, to secure your ports on Linux Anthony Pell 1 min read Apr 19, 2011 Today, Iknockd is a port-knock server. It listens to all traffic on an ethernet (or PPP) interface, looking for special The link for this article located at Linuxaria is no longer available. Prev: Hacking The NOOK Color To Run Honeycomb Next: Security fragmentation needs to end