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Scanning Modes

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takeshix edited this page Nov 21, 2016 · 3 revisions

Scanning Modes

KNXmap supports three different scanning modes:

  • Identifying KNX gateways via unicast discovery messages (default scan mode)
  • Scan for bus devices attached to KNX gateways (with optional device fingerprinting)
  • Searching KNX gateways via multicast messages (with --search)

Discovery Mode

This is the default mode of KNXmap. It sends KNX description request to the supplied targets in order to chceck if they are KNXnet/IP gateways.

knxmap scan 192.168.1.100

KNXmap supports to scan multiple targets at once by supplying multiple IP addresses separated by a space. Targets can also be defined as networks in CIDR notation:

knxmap scan 192.168.1.100 192.168.1.110 192.168.2.0/24

Bus Mode

In addition to the discovery mode, KNXmap also supports to scan for devices on the KNX bus.

knxmap scan 192.168.1.100 1.1.5

KNXmap also supports bus address ranges:

knxmap scan 192.168.1.100 1.0.0-1.1.255

The default mode is to only check if sending messages to a address returns an error or not. This helps to identify potential devices and alive targets.

Bus Device Fingerprinting

In addition to the default bus scanning KNXmap can also extract basic information from devices for further identification by supplying the --bus-info argument:

knxmap scan 192.168.1.100 1.1.5 --bus-info

Search Mode

KNX supports finding devices by sending multicast packets that should be answered by any KNXnet/IP gateway. KNXmap supports gateway searching via the --search flag. It requires the -i/--interface and superuser privileges:

sudo knxmap --interface eth1 search

Note: Packet filtering rules might block the response packets. If there are no KNXnet/IP gateways answering their packets might be dropped by netfilter/iptables rules.

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