Re: nmap udp scan takes too long

[pentester <pentester () surfhier nl>]

Reason is that nmap waits for a response, retries, waits etc. Once it decides the port is not responding it continues. 
There is a little smartness, because nmap tries different ports simultaneously.
Another scanner solves this issue. unicornscan typically scans al 64k ports in 3 minutes and 45 seconds when you use a 
scan rate of 300 packets per seconds

To my knowledge, unicornscan is today still the best way to do a udp scan. Possible issue is that it is available in 
Linux only. I have not seen working versions on Windows or Mac (although I expect in theory it should be possible to 
get it working on Mac).

Cor

On Jun 29, 2012, at 9:13 AM, a bv wrote:

> Hi,
>
> Using mosly zenmap , udp scan takes so long mostly . I try to scan all
> ports 1-65535 but also i do that at tcp scan too at the same port
> range but tcp scan takes too little time according to udp. I start to
> udp scan a few local hosts
>
> and after a day when i turn to the screen i see that it gives %40.3
> etc and not completed yet (not sure if it still continues to scan).
> What can be the reason and what is the best /efficient way to do a udp
> scan?
>
>
> Regards
>
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------------------------------------------------------------------------
Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate.  We look at how SSL works, how 
it benefits your company and how your customers can tell if a site is secure. You will find out how to test, purchase, 
install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for set-up are 
highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1
------------------------------------------------------------------------