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?
try portscanning as well as OS identification: nmap -O -p 1-512 XXX.XXX.XXX.0/24 see if that helps .. or if you just want to see who is up: nmap -sP XXX.XXX.XXX.0/24 (this is using nmap 2.12) if it still doesn't work try the latest version of nmap www.insecure.org/nmap nate -- ::: ICQ: 75132336 http://www.aphroland.org/ http://www.linuxpowered.net/ [EMAIL PROTECTED]
