Re: nmap status question

[john mathew <applicant3 () rediffmail com>]

In-Reply-To: <20030728180326.22164.qmail () www securityfocus com>

Hi Marc ....

A port is in either of the two states ie , open or closed at any point of 
time. But using a firewall a particular port can be blocked.In such a 
scenario when nmap is run aganist  a system which has a particular port 
blocked by a firewall , then the nmap result will show that the particular 
port as filtered .

Normally nmap will show only two types of output ie the open and the 
filtered ports , the closed ports are not shown .


Regards 

Mathew 









> i am new to linux but after getting my rh9 box running
> i have started to use nmap to do some scanning of my
> networks.  can someone tell me exactly what it means
> when the state of a particular port is 'filtered'?  
>
> thanks,
> marc
>
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