Thread: Xiaomi Router
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Old 15. Mar 2016, 02:28 PM   #2 (permalink)
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Join Date: Jul 2010
Location: New Zealand
Posts: 1,741

It is normal to have closed ports. It is also normal to have stealth ports.

The difference relates to the response from the port:
  • A closed port responds with a reset (RST) packet.
  • A stealth port doesn't respond with any packet.
  • There's also options like sending an error/invalid packet
I don't really care what happens on any port other than the ones that are open, i.e. will form a connection. Although, technically, it is probably better to have all ports responding the same way to invalid attempts to connect.

Assuming a system has open ports then chances are that port scanners will find them. When they do the issue is whether the system is secure enough to protect itself.
Better to light a candle ... than to curse the darkness.
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