dbeacon is a multicast beacon. Its main purpose is to monitor other beacon's reachability and collect statistics such as loss, delay and jitter between them. . dbeacon supports both IPv4 and IPv6 multicast, collecting information using both Any Source Multicast (ASM) and Source-Specific Multicast (SSM). . This package also includes dbeacon matrix, a Perl script to generate beacon reachability matrices in HTML.