[网络协议]基于udp做服务发现

It operates over TCP and UDP port 3702 and uses IP multicast address 239.255.255.250. As the name suggests, the actual communication between nodes is done using web services standards, notably SOAP-over-UDP.

With WS-Discovery, the discovery tool puts SSDP queries on the network from its unicast address to 239.255.255.250 multicast address, sending them to the well-known UDP port 3702.