defeating nmap -PN - Linux Forums

10-14-2009	#1 (permalink)
muton Just Joined! Join Date: Jul 2009 Posts: 26	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?

10-15-2009

#2 (permalink)

GNU-Fan

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Join Date: Mar 2008

Posts: 602

Quote:

Originally Posted by muton

also, how else can i be seen as online, with tcp/udp/icmp blocked?

Because you are known to other network nodes.
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.

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4 Weeks Ago	#3 (permalink)
muton Just Joined! Join Date: Jul 2009 Posts: 26	i see, thanks.

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