Netdiscover

Description

Netdiscover is an active/passive address reconnaissance tool, mainly developed for those wireless networks without dhcp server, when you are wardriving. It can be also used on hub/switched networks.

Built on top of libnet and libpcap, it can passively detect online hosts, or search for them, by actively sending arp requests, it can also be used to inspect your network arp traffic, or find network addresses using auto scan mode, which will scan for common local networks.

Usage

Command line usage & parameters:

Usage: netdiscover [-i device] [-r range | -p] [-s time] [-n node] [-c count] [-f] [-S]
  -i device: your network device
  -r range: scan a given range instead of auto scan. 192.168.6.0/24,/16,/8
  -p passive mode do not send anything, only sniff
  -s time: time to sleep between each arp request (miliseconds)
  -c count: number of times to send each arp reques (for nets with packet loss)
  -n node: last ip octet used for scanning (from 2 to 253)
  -S enable sleep time supression betwen each request (hardcore mode)
  -f enable fastmode scan, saves a lot of time, recommended for auto

If -p or -r arent enabled, netdiscover will scan for common lan addresses

On screen usage keys:

  h      Show help screen
  j      Scroll down (or down arrow)
  k      Scroll up (or up arrow)
  a      Show arp replys list
  r      Show arp requests list
  q      Close help screen or end application

Some examples of usage

  • Scan a class C network, to see wich hosts are up

    # netdiscover -i wlan0 -r 192.168.1.0/24

  • Scanning /16 network, trying to find online boexes

    # netdiscover -i wlan0 -r 192.168.0.0/16

  • Scan a class A network, trying to find network addresses

    # netdiscover -i wlan0 -r 10.0.0.0/8

  • Auto scan common networks

    # netdiscover -i wlan0

  • Dont send arp requests, listen only

    # netdiscover -i wlan0 -p

If you want to change your mac address for the scan, try:

# ifconfig wlan0 down
# ifconfig wlan0 hw ether 00:11:22:33:44:55
# ifconfig wlan0 up
# netdiscover -i wlan0 [options]

Sample output

netdiscover Netdiscover
 Image1: List of arp replies found actively scanning a 192.168.1.1/24 network.

sample2 Netdiscover
 Image2: List of arp request passively found.

sample3 Netdiscover
Image3: List of unique hosts found trough arp replies or requests.

sample4 Netdiscover
 Image4: Sample output of help screen containing controls

Source : http://nixgeneration.com/~jaime/netdiscover/ 

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