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I'm a high schooler in a CyberDefense Class and we are learning to PenTest.

I'm on Red Team and my teacher set up a system with Rasbian as the OS. When I run a scan on the computer scanning the Top 20 ports with nmap. It all comes up with filtered, including the Windows ports.

And when I run a scan, doing a nmap -v -O 172.16.0.89 it ends immediately. I've changed my IP address and MAC address.

So I have two questions here, How could it be that all the top 20 ports are filtered while all being windows ports on a Debian-based OS, and how could he still be blocking my virtual machine?

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  • Do you know what filtered means?
    – schroeder
    May 2 at 14:50
  • Are you sure the scan is being blocked? Or is the problem on your end? Have you tried -vvv?
    – schroeder
    May 2 at 14:53
  • Ports don't depend on the OS. You can have any number of ports open or not on any OS. There is just typical ports that are used by certain OSes.
    – schroeder
    May 2 at 14:56
  • I changed my post, I know what filtered means. And I am sure it's being blocked, Ill try -vvv when I'm back in class tomorrow
    – Aaron908
    May 2 at 14:56
  • You could run ssh on every port from 1-1024 all at once. And filtered doesn't mean open ....
    – schroeder
    May 2 at 14:57

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