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