Ok, I'm trying to use NMAP to scan a firewall and it returns all ports as being "Interesting Ports" and open. I know it only has port 80 and 25 open (because it's my firewall!). Why is it returning this and how can I get accurate results?
Dunno why it's doing it. Run nmap in one window and tcpdump in another. I'm assuming you doing a tcp scan so use tcpdump to see if you get an ACK packet in response to your SYN packet. If you don't then nmap is wrong -- if you do -- then your firewall has problems.
Hope this helps....
-- Joe
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