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Network Security Pen-Test
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Re: nmap udp scan time

Subject: Re: nmap udp scan time
Date: 10 Nov 2007 18:23:24 -0000
Hello Kevin,

I wish to say something about UDP scan.

In UDP scanning, Open port is detected with no response and a Closed port is 
detected with ICMP PORT UNREACHABLE (Code 3, Type 3) response.

Linux kernels limit ICMP error message rates, with Port Unreachable set to 80 
per 4 seconds, thereafter implementing a 1/4 second penalty if the count is 
exceeded. This makes the scan slow !!

---
Nikhil Wagholikar
Information Security Analyst
NII Consulting
Web: http://wwww.niiconsulting.com

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