On 24-Mar-2001 Viktor Rosenfeld wrote:
> Hello list,
>
> I have a problem. I am trying to portscan an entire network (Nope, I'm
> not a script kiddie, I just have to find out what Linux boxen are
> installed on the corporate network which I am supposed to administer),
> and I use `nmap -O XXX.XXX.XXX.0/24` as root to find out the OS the
> boxen are running. Unfortunately, nmap is unable to find some hosts
> when scanning an entire network. However if I portscan that machine
> directly, it is up and running and nmap reports the open ports
> correctly.
>
> Any idea, what could be the cause for nmap's failure to correctly
> identify a box as up? This box has no ipchains installed and it is
> responding to pings like a charm.
>
> Are there any other tools that reliably tell whether a machine is up or
> not?
Well, try something along this:
nmap -v -v -P0 -O A.B.C.1/24
Keep in mind that it will only scan machines in the "A.B.C.X" class C - i.e if
you're scanning 10.1.2.X, it won't find machines under 10.1.3.X, of course.
Hope this helps.
>
> TIA,
> Viktor
> --
> Viktor Rosenfeld
> WWW: http://www.informatik.hu-berlin.de/~rosenfel/
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>
>
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