The probes are an essential part of the DVG. These are the collectores of the data. Currently there are following different kind of probes:
List of SNMP probes are on the snmp probes index page.
List of Binary probes are on the binary probes index page.
List of Module probes are on the modul probes index page.
Dummy Probes do not collect any data from the hosts. These probs are use to manipulate the data from other rrd-streams: like sums of link-usages.