Re: nmap udp scan time

From: visitnikhil@gmail.com
Date: Sat Nov 10 2007 - 13:23:24 EST

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('binary' encoding is not supported, stored as-is) 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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Next message: Paul Greene: "What does a network having all identical MAC addresses mean?"
Previous message: Dragos Ruiu: "CanSecWest 2008 CFP (deadline Nov 30, conf Mar 26-28) and PacSec Dojo's"
Maybe in reply to: Kevin Mc Grath: "nmap udp scan time"
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