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listnd

listnd is a command line tool for discovery of devices on a network and listing them. The discovery process is passive in the sense that listnd does not send any packets to discover devices on the network. Instead, it only captures packets on a network interface and analyses them.

Installation

listnd requires libpcap to capture packets from network interfaces. So, make sure you have libpcap installed. For example on a debian-based distribution:

$ sudo apt install libpcap-dev

After installing dependencies you can download, build and install listnd with its other dependencies to your GOPATH or GOBIN (usually ~/go/bin/) with the go tool:

$ go install github.com/hwipl/listnd/cmd/listnd

Usage

You can run listnd with

$ listnd

Make sure your user has the permission to capture traffic on the network interface.

You can specify the network interface with the option -i. For example, you can specify the interface eth3 with:

$ listnd -i eth3

Command line options of the listnd command:

  -debug
        set debugging mode
  -f file
        set the pcap file to read packets from
  -http address
        use http server and set the listen address (e.g.: :8000)
  -i interface
        set the interface to listen on
  -interval seconds
        set output interval to seconds (default 5)
  -pcap-filter filter
        set pcap packet filtering to filter
  -pcap-promisc
        set pcap promiscuous parameter (default true)
  -pcap-snaplen bytes
        set pcap snapshot length parameter to bytes (default 1024)
  -pcap-timeout seconds
        set pcap timeout parameter to seconds (default 1)
  -peers
        show peers

When listnd is running, it periodically prints the discovered devices and information it was able to gather about them to the console.

Examples

Running listnd on a small home network for a short period:

$ sudo ./listnd -i eth3
[...]
======================================================================
Devices: 2                                       (pkts: 5246)
======================================================================
MAC: 5c:49:79:fe:dc:ba                           (age: 1, pkts: 3317)
  Properties:
    Router: true                                 (age: 122)
    Powerline: true                              (age: 2)
  Unicast Addresses:
    IP: 2001:c0ff:eec0:ffee:5e49:79ff:fefe:dcba  (age: 93, pkts: 1)
    IP: fe80::5e49:79ff:fefe:dcba                (age: 52, pkts: 1)
    IP: 192.168.1.1                              (age: 87, pkts: 12)
  Multicast Addresses:
    IP: 224.0.0.251                              (age: -1, pkts: 0)
    IP: 224.0.0.22                               (age: -1, pkts: 0)
    IP: 224.0.0.2                                (age: -1, pkts: 0)
    IP: 239.255.255.250                          (age: -1, pkts: 0)
    IP: 224.0.0.252                              (age: -1, pkts: 0)

MAC: 70:85:c2:ab:cd:ef                           (age: 1, pkts: 1929)
  Unicast Addresses:
    IP: 192.168.1.23                             (age: 1, pkts: 1842)
    IP: fe80::7285:c2ff:feab:cdef                (age: 52, pkts: 5)