DNS with mapping service in identifier locator split architecture

This paper mainly introduces the basic functions of DNS, and its usage for mapping service in the Identifier Locator Split (ILS) schemes, as one transitionally functional component in future network architecture. As well known, the overloaded semantics of IP address, being used for both endpoint identifier and routing locator in traditional internet, has hindered the smooth support for mobility of mobile users in network layer, thus lots of ILS schemes have been proposed to solve this problem, with considerations of enabling node mobility, multi-homing, universal connectivity and optimized routing scalability simultaneously. In these proposed ILS schemes, DNS is usually involved in different levels. In general, there exist four types of DNS's roles with Identifier Locator Mapping System (ILMS) in ILS architectures: Usage in a traditional way for merely translating hostnames to IP addresses; Support direct resolution from identifier to locator during node mobility, using newly defined Resource Records (RRs); Serve as a redirection agent for nodes to pinpoint the right mapping servers for further queries; And function in a hybrid manner for both direct resolution with new RRs and redirection service. In addition, some key performance metrics of DNS for ILMS are highlighted as well, and competing approaches for ILMS other than DNS are also discussed. As a result, through our detailed analyses in this survey, a better understanding for DNS's functions, especially with mapping service in ILMS, could be achieved.