CoDoNS

In paper The Design and Implementation of a Next Generation Name Service for the Internet, the authors Venugopalan Ramasubramanian Emin Gu ̈n Sire introduced CoDoNS,the next generation of domain name system. The motivations of improving our current domain name system come from three aspects: first is that our current DNS are extremely vulnerable to denial-of-service attack, second is that delays in DNS transitions are generally very long, (thirty percent of web retrievals take more than one second for look up) and third is that because of lack of cache coherency, the length of period in which clients are waiting for update is too big, which preventing quick service relocation in response of change of environment. The newly-designed Cooperative Domain Name System (CoDoNS) may effectively solve these problems in current DNS respectively by exhibit three new features: resilience to attacks, high performance and fast update propagation. Structurally, CoDoNS follow peer-to-peer overlays. This gives advantage of resilience to attacks because the whole system relies less on a central server, which is usually object of DoS attacks. Furthermore, CoDoNS applies analytically informed proactive caching, which increase the system's adjustability to change of environment. This caching layer, called Beehive, replicates DNS mappings to matching anticipated demand, which provides a guaranteed strong performance. Intuitively, when then whole system is implemented, it works like a giant distributed system, where each client participate locally. Notice that despite the advantages of this fresh designed system, it is impossible to replace the current DNS overnight. The possibly takeover process must be done piece by piece.