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Delay Tolerant Network (DTN) is evolved from Mobile Adhoc Network, MaNet. It is sparse and intermittently connected mobile adhoc network where reliable communication and end-to-end connectivity is not available for message transmission. The end to end connectivity is not ensured in Delay Tolerant Network. Only high latency applications are used in DTN. Latency may be in hours or days. The store and forward approach helps to increase message delivery probability in DTN irrespective of time taken to delivered message over normal MaNet. In DTN, the two or more nodes can exchange message when they move in transmission range of each other. Routing issue is very important due to limited resources for message storage and forwarding. This Routing issue is considered by many researchers which results in many routing protocol based on Flooding and Forwarding Approach. In this paper we try to summarize the routing protocols till date which are available in literature. We also try to compare the entire routing protocol. This paper gives right direction to researchers to proceed for designing a new routing protocol for Delay Tolerant Network.
Mangrulkar et al. (Fri,) studied this question.