Hi Paolo,

With multicast IP finder you should have a separate multicast group address
for each topology. It can be configured like this:

<property name="discoverySpi">
    <bean class="org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi">
        <property name="ipFinder">
            <bean
class="org.apache.ignite.spi.discovery.tcp.ipfinder.multicast.TcpDiscoveryMulticastIpFinder">
                <property name="multicastGroup" value="228.1.2.5"/>
            </bean>
        </property>
    </bean>
</property>

All nodes with the same group address will join the same topology, while
nodes with different group addresses will never discover each other.

-Val



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