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I recently did an Nmap scan of my network with the ZenMap GUI tool on my Ubuntu install and I got a weird scan result; well in my opinion anyways..

Even though I am using Ubuntu 15.04, for my host, I get the following results:

Device Type: AXIS Linux 2.6.X, Linux 2.6.X, ZyXEL embedded
OS CPE: cpe:/h:axis:210a_network_camera cpe:/
h:axis:211_network_camera cpe:/
o:axis:linux_kernel:2.6 cpe:/
o:linux:linux_kernel:2.6 cpe:/
o:google:android:2.2 cpe:/h:zyxel:nsa-210
OS details: AXIS 210A or 211 Network Camera (Linux 2.6.17), 
Linux 2.6.14 - 2.6.34, Linux 2.6.17, Linux 2.6.17 (Mandriva), Android
2.2 (Linux 2.6), ZyXEL NSA-210 NAS device
Network Distance: 0 hops

I also got a warning from the log that the results may be unreliable however, it's weird I got these results since the other hosts that were detected in the scan were correct.

My question now are these results normal or should I be alarmed since I do not have any of those indicated in my logs being used.

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  • Which version of nmap do you have? and what options have you used with nmap for scanning? – jijinp Jul 17 '15 at 9:38
  • My nmap version is 6.47 however I am using the gui version zenmap. The commands I used was nmap -sV -T4 -O -F --version-light 10.10.10.* – NuWin Jul 17 '15 at 16:04
  • I've tried nmap -sV -T4 -O -d 10.10.10.* as well with same results – NuWin Jul 17 '15 at 16:30
  • Funny thing about zenmap which you say below. It's not always as reliable as the nmap tool being called from the command line. Call your same command directly from the command line with nmap and not zenmap and see if you get different output. – Thomas Ward Jul 17 '15 at 19:12
  • @ThomasW. Thank you for the comment but when I used your advice I got the same results in nmap. – NuWin Jul 17 '15 at 19:30
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Nmap covers misidentified hosts in the online documentation, but here is the short version:

  1. Make sure you are using the latest Nmap.
  2. Get better scan conditions. Nmap will give unreliable results if you are more than 5 network hops away, if you are scanning with -T5, or if there were no open or no closed TCP ports discovered.
  3. Send a correction if Nmap still guesses wrong. This improves the database for everyone.
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What command did you typed in to get this output ?

May the man nmap can help you to fix your command if you don't want to share it.

To get to know your ubuntu version use

lsb_release -a

The output should be like

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 15.04
Release:    15.04
Codename:   vivid

To check your nmap version type

nmap -V

Just to compare: When I type your command nmap -sV -T4 -O -d 10.10.10 I get (I skipped the scanning part)

Starting Nmap 6.47 ( http://nmap.org ) at 2015-07-17 20:51 CEST
PORTS: Using top 1000 ports found open (TCP:1000, UDP:0, SCTP:0)
--------------- Timing report ---------------
  hostgroups: min 1, max 100000
  rtt-timeouts: init 500, min 100, max 1250
  max-scan-delay: TCP 10, UDP 1000, SCTP 10
  parallelism: min 0, max 0
  max-retries: 6, host-timeout: 0
  min-rate: 0, max-rate: 0
---------------------------------------------
NSE: Using Lua 5.2.
NSE: Script Arguments seen from CLI: 
NSE: Loaded 29 scripts for scanning.
Initiating Ping Scan at 20:51
Scanning 256 hosts [4 ports/host]
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  • My lsb_release -a response was the same as above. Please check the comment above for the cmd I used for the scan. – NuWin Jul 17 '15 at 16:11
  • thanks. I added my ouput of your command for comparing. I'm using nmap 6.47 which version are you using ? – JonnyTischbein Jul 17 '15 at 18:55
  • My version is the same as yours however I am using the GUI version Zenmap. Thanks for showing your log results but what should I look for in this comparison? Also which cmd did you use because in the above comment I had two. – NuWin Jul 17 '15 at 18:58
  • Ahh! sorry. I used the second one. I realy do not know why your are getting this error – JonnyTischbein Jul 17 '15 at 19:26
  • I don't know either :/ any suggestions?? – NuWin Jul 17 '15 at 22:01

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