Aalyria Technologies This document specifies the Bundle Protocol Address Resolution Protocol (BP-ARP), a mechanism for discovering the Node ID of a Bundle Protocol Agent (BPA) that is reachable at a known Convergence Layer (CL) address. BP-ARP enables a BPA to resolve CL-layer adjacency into BP-layer peer relationships, bootstrapping higher- level protocols such as SAND. This document updates RFC 9758 to allow externally received bundles destined to the LocalNode administrative endpoint for registered administrative record types.