Re: port order in 5.00-2

[bensonk () acm wwu edu]

You can also use netcat (not ncat, sadly) with the -z flag, which says
"do no IO, just connect".  This might do what you want in a pretty small
package. 

This raises the question -- why doesn't ncat support netcat's -z?  Was
it decided that this sort of action should be taken by nmap or nping? 

Benson

On Wed, Nov 18, 2009 at 11:08:59AM -0800, Fyodor wrote:
> On Wed, Nov 18, 2009 at 12:17:07PM -0200, Miguel Rozsas wrote:
> > Hi,
> >
> > I am using nmap 5.00-2 in Ubuntu and 4.75 in opensuse.
> > Both versions doesn't respect the order of ports using the -p flag,
> > even using the -r (don't randomize) flag.
>
> Hi Miguel.  With -r, the ports are scanned in a sorted order (from
> lowest to highest) rather than randomized.  I've updated our
> documentation in SVN to make this more clear.
>
> > This could be a problem when using nmap to trigger firewall actions
> > that are based on the strict order of hits, i.e. port knocking.
>
> You could make a personal NSE script for this, or use our (alpha
> stage) Nping utility (http://nmap.org/nping/).
>
> Cheers,
> -F
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