nmap

Scans subnets using nmap and visualizes network topology in a browser.

Table of Contents

• nmap
  • Features
  • Network diagram
  • Help
  • Display host properties
  • Prerequisites
  • Installation instructions
    • Install packages
    • Test packages
    • Clone repo
    • Install gojs
  • Run nmapscan.pl
  • Nmap video

Features

• Performs OS detection and port scanning.
• Tracks subnet(s) gateways and route to internet.
• Shows network diagram of subnets with hosts.
• Use the mouse to drag the host objects around.
• Displays MAC address, vendor type, IP address, hostname, gateway, netmask, OS type, etc.
• Click on the icons in the corners of the host objects to display the host properties.

Network diagram

Help

'nmapscan.pl' is a commandline script written in Perl. It creates 'map.html' which contains html, javascript and the network topology data.

./nmapscan.pl -help
Help

Usage: 
       ./nmapscan.pl 
Optional:
       ./nmapscan.pl -subnet <cidr>[,<cidr>]                   Subnet(s) in CIDR notation.
       ./nmapscan.pl -debug                                    Display debug info.
       ./nmapscan.pl -help                                     This helptext.

Example:
       ./nmapscan.pl -subnet 192.168.1.0/24,192.168.100.0/24

View result 'map.html' in a webbrowser.  

CIDR is <network>/<netbits>. 
Lookup your Netbits:
+------+----------+------------------------------------+
| Net  | Number   |                                    |
| bits | of hosts |  Netmask                           |
+------+----------+------------------------------------+
| /8   | 16777214 |  255.0.0.0                         |
| /9   | 8388606  |  255.128.0.0                       |
| /10  | 4194302  |  255.192.0.0                       |
| /11  | 2097150  |  255.224.0.0                       |
| /12  | 1048574  |  255.240.0.0                       |
| /13  | 524286   |  255.248.0.0                       |
| /14  | 262142   |  255.252.0.0                       |
| /15  | 131070   |  255.254.0.0                       |
| /16  | 65534    |  255.255.0.0                       |
| /17  | 32766    |  255.255.128.0                     |
| /18  | 16382    |  255.255.192.0                     |
| /19  | 8190     |  255.255.224.0                     |
| /20  | 4094     |  255.255.240.0                     |
| /21  | 2046     |  255.255.248.0                     |
| /22  | 1022     |  255.255.252.0                     |
| /23  | 510      |  255.255.254.0                     |
| /24  | 254      |  255.255.255.0                     |
| /25  | 126      |  255.255.255.128                   |
| /26  | 62       |  255.255.255.192                   |
| /27  | 30       |  255.255.255.224                   |
| /28  | 14       |  255.255.255.240                   |
| /29  | 6        |  255.255.255.248                   |
| /30  | 2        |  255.255.255.252                   |
| /31  | -        |  point to point links only         |
| /32  | 1        |  255.255.255.255 single IP address |
+------+----------+------------------------------------+
Notes: 
   - Number of hosts = usable number of hosts.
   - CIDR = network address + /netbits, for example: 192.168.1.0/24
   - Instead of the network address, any IP within the subnet is accepted.
   - Be sure 'nmap', 'traceroute', 'iproute' and 'gojs' are installed!
   - You may need to do sudo (to become root) to run nmap: $ sudo ./nmapscan.pl -subnet 192.168.1.0/24

Display host properties

Click on the icons in the corners of the hosts object to display the host properties. There are 3 different types: Basic, detailed and port properties.

Top right corner: Basisc host info.

Bottom right corner: Host details:

Top left corner: Port host info:

Prerequisites

• nmap
• traceroute
• iproute
• perl
• gojs (check the license)
• root permissions

note: If your system does not meet these requirements then follow the installation instructions.

Installation instructions

Install packages

Ubuntu/Debian/Raspbian

$ sudo apt-get install nmap traceroute iproute perl git wget  

Centos/RHEL

$ yum install nmap traceroute iproute perl git wget   

Fedora

$ dnf install nmap traceroute iproute perl git wget 

Test packages

To test nmap (specify our own subnet):

$ nmap -O -n 192.168.1.0/24  

To test traceroute:

$ traceroute 8.8.8.8   

To test iproute:

$ ip add

Clone repo

Clone the repo to your locale host:

$ mkdir ~/git
$ cd ~/git
$ git clone https://github.com/tedsluis/nmap.git
$ cd ~/git/nmap

Install GoJS

To install the GoJS framework:

$ cd ~/git/nmap
$ wget https://gojs.net/latest/release/go.js

Note: read the license info!

Run nmapscan.pl

To run it (specify our own subnets):

$ ./nmapscan.pl -subnet 192.168.1.0/24,192.168.11.0/24 

Interface=enp2s0 (ip=192.168.11.80)
Interface=virbr0 (ip=192.168.122.1)
Host gateway=192.168.11.1
  192.168.1.0/24   (subnetwork=192.168.1.0/24,   netbit=24, subnetmask=255.255.255.0, network=192.168.1.0,   broadcast=192.168.1.255),   number of IP's=254
  192.168.11.0/24  (subnetwork=192.168.11.0/24,  netbit=24, subnetmask=255.255.255.0, network=192.168.11.0,  broadcast=192.168.11.255),  number of IP's=254
  192.168.122.1/24 (subnetwork=192.168.122.0/24, netbit=24, subnetmask=255.255.255.0, network=192.168.122.0, broadcast=192.168.122.255), number of IP's=254

Depeding on your system and network scanning will take quite a while! On a raspberry pi it can even take up to an hour!
Ones it is finshed you can view 'map.html' is a web browser.

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Nmap video

Watch a video at youtube: https://youtu.be/DMpabcP0r_U

GoJS framework

If you wish to use the GoJS library for your private evaluation, you may do so only under the terms of the Evaluation License Agreement.

• http://gojs.net/latest/doc/download.html
• http://gojs.net/latest/doc/license.html

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Ted Sluis ted.sluis@gmail.com
https://www.youtube.com/tedsluis