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I'll just leave that here: http://en.wikipedia.org/wiki/Port_knocking http://en.wikipedia.org/wiki/Port_knocking Not that I use or endorse it.

• jefe78 16y ago
  I've used and endorse it. Set it up to accept a knock sequence along the lines of: Port 38378, 1292, 65000, in quick succession. IMPOSSIBLE a port scan will ever hit those ports in that order. Have that sequence trigger a modification to your iptables or execute some script to modify sshd_config or whatever else. It works wonders and is another level of security.
  • rarrrrrr 16y ago
    Quite impossible, since TCP ports don't go past 65535. :)
  • jefe78 16y ago
    90,000 was an exaggeration. The point stands though.