Re: Nmap 4.21ALPHA4 DNS resolve timeout

["Eddie Bell" <ejlbell () gmail com>]

On 26/06/07, Henrik Zagerholm <henke () mac se> wrote:
> Sorry for being unclear but the output from my ruby script example is
> regexped so it doesn't return the same input.
> The bottom line is that my script is almsot 10 times faster than a
> single nmap call.
> How can that be.

Ah sorry, I misread your email, you do -sP both times. The results are
strange, perhaps it is something to do with being on a private
network. Have you tried the same thing on a public network?

> Question number 2 is that if I do  nmap -sL 10.0.0.5 and that IP
> doesn't have an entry in the DNS that call takes about 15 seconds.
> How can I set a timeout on this?

The DNS timeouts do not look like they not related to any command line
argument, instead they are defined in nmap_dns.c along with a group of
other performance parameters.  If you are desperate to improve the
speed you could edit these values but you may sacrifice reliability.

- eddie

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