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How can we check which ports are open on a firewall that use header flags? Any free tool that sends packets to the host to map these ports?

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I think that nmap should do the trick: nmap.org – Lucas Kauffman Feb 15 at 8:15
Hi Avraam - this is not really a useful question here as the information already exists. If you look at any of the questions here about network scanning you will find many examples of tools used, along with wider information on usage, pros and cons, detection techniques etc. – Rory Alsop♦ Feb 15 at 9:19

closed as not constructive by Terry Chia, Rory Alsop♦ Feb 15 at 9:17

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