Nmap Development mailing list archives
Nmap host timeout inquiry
From: tommymay () comcast net (Tommy May)
Date: Wed, 09 Jan 2008 15:30:28 +0000
Hello Nmap Folk: I am not an experienced developer, so please excuse my lack of knowledge on the inner mechanics. I have been trying to optimize nmap scans for host discovery and find that the built in T4 option works awesome (after having played with all of the customizable "rtt" options)... but I also would like to add the --host-timeout parameter to speed up scans a little. details: I am using an input file (-iL) with entire /24 networks - default "nmap -sTU -T4 -P0" on a reasonably fast /24 netblock with stateful firewall ruleset takes roughly 15 hours to complete, but its the most accurate results I have been able to produce (measure - all hosts that are truly up, result in the output file). - I have been able to complete a scan on the same network with "nmap -sTU -T4 -P0 --host-timeout 120m" in roughly 6 hours... but I notice that the second half of the netblock all times out... This leads me to suspect that the "--host-timeout" parameter may apply to all of the targets that you specifiy in the input list, rather than just IP by IP? This could explain why half of the IP's in the netblock timed out, when no timeout parameter catches all of the IP addresses in the netblock. Are my suspicions correct or am I just shooting in the dark? I would suppose that I would have to do a separate IP by IP scan to allow the --host-timeout parameter to work per IP? Any insight you may have as to how this parameter works in this way would be greatly appreciated, and will better help me to discover the optimal settings. Sincerely, Tommy May _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev Archived at http://SecLists.Org
Current thread:
- Nmap host timeout inquiry Tommy May (Jan 09)
- Re: Nmap host timeout inquiry ithilgore.ryu.L () gmail com (Jan 24)
- <Possible follow-ups>
- Re: Nmap host timeout inquiry Tommy May (Jan 24)
- Re: Nmap host timeout inquiry ithilgore.ryu.L () gmail com (Jan 26)