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/ > Geek Code (3.1): > GCS/SS d-@ s+: a20 C++@ UL++$ P+ L+++ E--- W++ N++ o? K? !W O? M? V? > PS++@ PE+(-) Y+ P?(+++) t+ 5+ X- R? !tv b+ DI+ D- G e>+++ h-- r- !y+ > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] -- Carlos Laviola - ICQ 55799523 pub 1024D/3516D372 2000-06-05 Carlos Laviola <[EMAIL PROTECTED]> Key fingerprint = 3BE1 6591 C78C 2AA4 31DD AEEF 6406 0227 3516 D372
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