[id='discovery-ping_{context}']
= PING
PING, or UDPPING is a generic JGroups discovery mechanism that uses dynamic multicasting with the UDP protocol.

When joining, nodes send PING requests to an IP multicast address to discover other nodes already in the {brandname} cluster.
Each node responds to the PING request with a packet that contains the address of the coordinator node and its own address. C=coordinator’s address and A=own address.
If no nodes respond to the PING request, the joining node becomes the coordinator node in a new cluster.

.PING configuration example
[source,xml,options="nowrap",subs=attributes+]
----
include::xml/ping.xml[]
----

[role="_additional-resources"]
.Additional resources
* link:{jgroups_docs}#PING[JGroups PING]
