A Table Overflow LDoS Attack Defending Mechanism in Software-Defined Networks

Table 3

Message type description.

Message type	Message	Function	Analyzed data
Controller-to-Switch	flow-mod	Install the flow entries to the switch	—
	flow-stats-request	Request the switch for flow entry statistics field information	—
	table-stats-request	Request the switch for flow table space usage	—
Asynchronous	state-change	Send switch connection and disconnect events to the controller	Update the number of SDN switches
	packet-in	Forward packets to the controller	The arrival rate of new flow
	flow-stats-reply	Reply to flow entry statistics field information to the controller	Flow entries matched packet, bytes, and duration
	table-stats-reply	Reply to flow table usage to the controller	Number of active flow entries
	flow-removed	Reports to the controller that the switch deletes the flow entry	Delete the corresponding flow entry data in the record

Note: OpenFlow specification v.1.3 was referenced for SAIA design.