NMAP scans detect all hosts active in a subnet, when in really not!

["Darren Shady" <Darren.Shady () sunh com>]

Greetings, 

 

I'm not too sure what's going on here.  Nmap 10.62.0.0/24 -s P results
in the following exerpt:

Host 10.62.0.246 is up (0.00s latency).

Host 10.62.0.247 is up (0.00s latency).

Host 10.62.0.248 is up (0.016s latency).

Host 10.62.0.249 is up (0.00s latency).

Host 10.62.0.250 is up (0.00s latency).

Host 10.62.0.251 is up (0.00s latency).

Host 10.62.0.252 is up (0.00s latency).

Host 10.62.0.253 is up (0.00s latency).

Host 10.62.0.254 is up (0.00s latency).

Host 10.62.0.255 is up (0.016s latency).

Nmap done: 256 IP addresses (256 hosts up) scanned in 2.11 seconds

 

C:\Documents and Settings\dshady>nmap -V

 

Nmap version 5.00 ( http://nmap.org )

 

This subnet does not have 256 hosts up, I know it to have only a few
active hosts.  This is a new problem.

 

Any suggestions?

 

C:\Documents and Settings\dshady>ver

 

Microsoft Windows XP [Version 5.1.2600]

 

 

 

 

Darren Shady 
IT Infrastructure Network Engineer 
L|PT,E|CSA, C|EH, C|HFI, CCNA, MCSE, MCSA, MCDST, Security+, A+, Net+,
I-Net+ 
Sun Healthcare Group, Inc. 
505-468-5489 - Office 
505-553-2414 - Mobile 

 

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