corosync udpu mystery ports

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First, thanks for taking the time to read this email.  I am using corosync and pacemaker on a security appliance we manufacture.  I am running udpu mode.  I see that for each interface I define, there is a udp listening socket using the mcastport I defined in corosync.conf and two other ephemeral listening ports.  The mcastaddr port is bound to the interface I defined in corosync.conf.  The ephemeral ports are bound to all interfaces.   I would like to know what the purpose of those ports are, and why they are bound to 0.0.0.0.  Thanks.

 

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