I'm currently studying a peneteration/hacking course. I am trying to use nmap against a target to find all the ports that are filtered.
I thought if I used an ACK-scan nmap would give me all the filtered ports. I used
nmap -sA -p- target
and the result was All the 65535 ports scanned are unfiltered. Is this even reasonable? What other scans can I use to complement my first scan?
Small world. I had such a discussion with a person new to port scanning and they had run this scan on their PC, scanning their own PC. The result was all ports were not blocked. Also a nod to https://serverfault.com/questions/672938/is-there-a-way-to-see-what-is-actually-filtering-tcp-port-communication
I don't see why I need to point out the futility of the scan they did.
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