Title: A Distributed Adaptive Cache Update Algorithm for the Dynamic Source Routing Protocol (NYU-CS-TR842) Authors: Xin Yu and Zvi M. Kedem Abstract: On-demand routing protocols use route caches to make routing decisions. Due to frequent topology changes, cached routes easily become stale. To address the cache staleness issue in DSR (the Dynamic Source Routing protocol), prior work mainly used heuristics with ad hoc parameters to predict the lifetime of a link or a route. However, heuristics cannot accurately predict timeouts because topology changes are unpredictable. In this paper, we present a novel distributed cache update algorithm to make route caches adapt quickly to topology changes without using ad hoc parameters. We define a new cache structure called a cache table to maintain the information necessary for cache updates. When a node detects a link failure, our algorithm proactively notifies all reachable nodes that have cached the broken link in a distributed manner. We compare our algorithm with DSR with path caches and with Link-MaxLife through detailed simulations. We show that our algorithm significantly outperforms DSR with path caches and with Link-MaxLife.