“Getting to know your enemy through network ports and port
scanners.“
“For the serious newbies out there, here’s how networks work on
a really, really basic level. Your system’s master process, the one
that got the system going (after you pushed the ‘on’ switch that
is) is called ‘init’. init’s process ID is 1. It is always 1. If
you want to check it out, find init in your process table using
‘ps’…”
“From a resources perspective, it makes sense to have a single
process listening rather than one for each and every service. For
those of you who can remember and visualize such things, picture
Lily Tomlin as the telephone operator who (eventually) patches
people through to the party to whom they wished to speak. She is
inetd and the people to whom you wish to speak are the service
deamons. You request extension 23 and eventually, she puts you
through.”