Re: Doubt about nmap -sP

[Sundhar <sundhar.i14 () iiits in>]

Hi,
      Thanks for replying. As you said I scanned my network again(both with
root and as a regular user), this time I ensured that the phone is not in
standby mode but still the problem seams to exist. I also tried -sn in this
mode nmap did not discover the phone when it is being operated as root (I
tried for 5 times) but it is able to detect with same problem as that of
-sP when it is not in root.I am attaching the screen shots of all the above
mentioned cases.

On Sat, Dec 17, 2016 at 5:55 PM, Jacek Wielemborek <d33tah () gmail com> wrote:

> W dniu 16.12.2016 o 05:03, Sundhar pisze:
> > hi all,
> >              I am new to nmap. I faced a problem while learning, I
> > scanned my home network with nmap -sP 192.168.225.1/24
> > <http://192.168.225.1/24> the result included my laptop and the gateway
> > but it did not contain my two android phones.so, I performed the scan
> > again. This time the result  included all the devices. After seeing this
> > I tried scanning for few more times and I realized that sometimes the
> > scan is listing all devices and sometimes it isn't. (did not contain the
> > 2 android phones). can anyone tell me what might be the reason?
>
> What conditions change? For example, do you get your phone up from
> standby between tests? Like in first test (where the phone isn't
> discovered) has the phone been in standby for a long period, then you
> acivated it before the second attempt and it re-connected to the network?
>
> Or could it be that you had one attempt as a regular user and the other
> as root? I wouldn't be surprised if Nmap's host discovery was more
> effective as root, where it could also send ARP queries.
>
> Also, keep in mind that in current nmap, -sP is now -sn. -sP is only
> kept for compatibility purposes.


-- 
Best Regards,
Sai Sundhar.

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