defeating nmap -PN
I've discovered that even if you block tcp/udp/icmp input and output to and from a host you can still port scan that host and find out it's open ports. I'm assuming this means that that host can still do the same to me. Is there a way to block port scanners like this so I know that they can't see me online?
also, how else can i be seen as online, with tcp/udp/icmp blocked?
Because you are known to other network nodes.
Originally Posted by muton
Imagine the police asking your neighbourhood questions about you and showing everybody a picture of you. Finally you will be found, no matter if you answer the doorbell or not.