SDNDefender: A Comprehensive DDoS Defense Mechanism Using Hybrid Approaches over Software Defined Networking

Table 3

The structure of a rule option.

Keyword	Description
Rid	Rule ID
Msg	A message for rule matching
Pri	Rule priority
Clstype	The type of an attack event
Filter	Parameters for detecting an attack
Content	Targeted patterns in a packet’s payload
Dsize	Payload size for matching
Nocase	Case-insensitive matching
Reg	Wildcard-supported matching