Advanced Hashing with Hybrid Key Duplication for IP Address Lookup

Hashing techniques have been widely adopted for general IP address lookup and specific network intrusion detection. In most current commonly used XOR-hashing algorithms, each of the hash key bits is usually explicitly XORed only at most once in the hash process, which may limit the amount of potential randomness that can be introduced by the hashing process. This paper further looks into various ways in duplicating and re-using key bits to maximize randomness needed in the hashing process so as to enhance the overall performance further.