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

Subject: Re: how nmap can know my firewalled servers ?
Date: Thu, 13 Apr 2006 14:18:12 -0400
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Alice Bryson wrote:
Yes, i agree that.
How about UDP, if an udp port firewalled, how does NMAP know it?

I believe with UDP scanning you're either going to get a result of
closed (System responded with an ICMP port unreachable), or
Open|Filtered meaning that no response was received which could mean
filtering or something listening and not responding.

- --
 Gregory Boyce | gboyce@akamai.com
 Security Operations  -  Team Lead
 Akamai Technologies | 617-444-3041
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