If you want automatic discovery of members, you can use multicast-based MPING instead of
TCPPING:
http://wiki.jboss.org/wiki/Wiki.jsp?page=JGroupsMPING.
Regular traffic between the members would still use TCP; UDP multicast is used when a node
joins the cluster and needs to dynamically discover the cluster members.
With TCPPING, yes, you should list all members.
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