Re: nmap performance -> timeout issue

[MadHat <madhat () unspecific com>]

On Apr 13, 2005, at 1:29 PM, Maarten Hartsuijker wrote:
> I'm currently installing an audit environment that should periodically
> audit several subnets. I've been trying to tune nmap for the initial 
> sweep
> of the subnets in order to bring the time-to-completion down.

One point missing...  version of nmap?  I ran into a problem with some 
of the recently older versions.  Fyodor said he was trying to make nmap 
more accurate, but made it slow down a lot.  This was "fixed" in more 
recent versions (I know 3.8x it is fixed).  I also found that nmap 
would stall some times on a single host, which is why I originally 
wrote my nmap wrapper to run X number of nmap processes in parallel.  I 
think at last count I was scanning more than 180K IPs in less than 16 
hours, but I had ICMP enabled for all my hosts to/from my monitoring 
host.



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