Nmap Development mailing list archives
Re: Simultaneous invocations of nmap
From: doug () hcsw org
Date: Tue, 19 Feb 2008 17:54:01 -0800
Hi Rick, Good question. Yes, people have thought about doing this before. In Fyodor's soon-to-be-released book on Nmap there is a short section about executing multiple instances in parallel. Fyodor warns that performance can actually suffer due to context switching and memory overhead. Usually one Nmap instance will be able to fully saturate your network connection to the target networks, but this isn't to say that you shouldn't give it a shot. If you do, please let us know how it turns out. In particular, I'm curious as to whether this tactic could improve performance by taking advantage of multiple processors/cores in modern SMP machines. Good luck, Doug On Tue, Feb 19, 2008 at 08:29:30PM -0500 or thereabouts, Rick Rineholt wrote:
Hi Has anyone done any performance studies on invoking simultaneous instances of nmap on the same machine each covering separate subnets versus executing a single instance specifying all the subnets? One reason I ask is I thought I read some info that nmap has some built in mechanism to throttle back sending out explanatory packets if it starts losing too many and surely having more than one instance at a time running I would think would interfere with that mechanism. Are there any guide lines available to help performance of discoveries on very large networks? Thanks _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev Archived at http://SecLists.Org
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Current thread:
- Simultaneous invocations of nmap Rick Rineholt (Feb 19)
- Re: Simultaneous invocations of nmap doug (Feb 19)
- Re: Simultaneous invocations of nmap Brandon Enright (Feb 20)
- Re: Simultaneous invocations of nmap Rick (Feb 21)
- Re: Simultaneous invocations of nmap Brandon Enright (Feb 20)
- Re: Simultaneous invocations of nmap doug (Feb 19)