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How To Verify that Multicast Communication Works Correctly Between Machines the Coherence Cluster Members Are Running On (Doc ID 1936452.1)

Last updated on AUGUST 13, 2018

Applies to:

Oracle Coherence - Version 3.4.0 and later
Information in this document applies to any platform.

Goal

This document explains by example how to use the multicast test utility shipping with Coherence.

By default Coherence uses multicast communication for messages supposed to be sent to more than 25% of the cluster members.

Coherence switches off multicast communication if well-known addresses (WKAs) had been configured.

So, it is not required to run the multicast test if well-known addresses are going to be used in the target environment.

Further details about the Coherence multicast test utility and about troubleshooting multicast issues can be found at: Oracle Fusion Middleware Administering Oracle Coherence, 12c (12.1.3), 4 Performing a Multicast Connectivity Test

Solution

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In this Document
Goal
Solution
 1. Description Of The Example Network Topology
 2. Verify That The NICs Are Bound To The Expected IP Addresses Of Subnet 192.168.10.0/24 On Each Compute Node
 3. Test the Multicast Communication On All Compute Nodes The Coherence Cluster Members Are Running On
 4. Check If There Is a Firewall Which Is Blocking Datagrams Sent By com.tangosol.net.MulticastTest on oel654
 5. Shutdown The Firewall On oel654 Which Is Blocking Datagrams Sent By com.tangosol.net.MulticastTest

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