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Network Security Security-Basics
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how nmap can know my firewalled servers ?

Subject: how nmap can know my firewalled servers ?
Date: Wed, 12 Apr 2006 16:23:42 -0200
Hi all !
I know that "nmap" can show open ports. But nmap also shows myfirewalled ports 
!How?
Since some servers (like apache) are firewalled with iptables, how cannmap know 
wherevermy system run the service with open port, filtered port or doesn't 
runit at all ?

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