DJ.2. The Discovery Protocols
There are three closely related discovery protocols: one is used to discover one or more lookup services on a local area network (LAN), another is used to announce the presence of a lookup service on a local network, and the last is used to establish communications with a specific lookup service over a wide-area network (WAN).
DJ.2.1. Protocol Roles
The multicast discovery protocols work together over time. When an entity is initially started, it uses the multicast request protocol to actively seek out nearby lookup services. After a limited period of time performing active discovery in this way, it ceases using the multicast request protocol and switches over to listening for multicast lookup announcements via ...
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