""Port knocking" is idiosyncratic and widely looked down on by security engineering teams" I can't comment on that. I'm not a UNIX sysadmin because it's a rew

""Port knocking" is idiosyncratic and widely looked down on by security engineering teams" I can't comment on that. I'm not a UNIX sysadmin because it's a rewarding career path with excellent opportunities for advancement. I'm a UNIX sysadmin because I truly love doing it and always have. I would do it for free.