Nmap Development: Re: nmap-3.7x MUCH slower than nmap-3.55 against firewalled hosts

[Martin Mačok <martin.macok () underground cz>]

On Thu, Dec 16, 2004 at 01:22:32PM +0100, Martin Mačok wrote:

> > If you have time to scan such a class C again, how does Nmap 3.78
> > do with "-T4 --min_hostgroup 256 --max_scan_delay
> > 0 --max_rtt_timeout XXX" (where XXX is about double the average
> > ping time against hosts on the target network).  How does that
> > compare to 3.55?
> Nmap-3.78 wins here but generates much more traffic. When scanning
> less than 25 hosts paralelly, nmap-3.55 wins.
Correction - nmap-3.78 looses in all cases when ICMP rate-limit is
implemented C-wide - e.g., there is a single firewall in front of the
whole C block. Paralelisation doesn't help here.

Martin Mačok
IT Security Consultant

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