When we bring the interface down and back up in a complete (udp.xml) configuration everything seems to be fine, however multicast traffic from the node that had the interface brought down is not received by other nodes. The node also doesn't receive any data from the other nodes. No exceptions are logged. I don't think the previous test was done correctly by me ... sorry .

When we use TCP + MPING we see the stacktraces we had previously with UDP:

12:13:51.624 50644 [Timer-3,debug,shockvm-tn3-42192] ERROR unknown.jul.logger - failed sending discovery request
java.io.IOException: Invalid argument
at java.net.PlainDatagramSocketImpl.send(Native Method) ~[na:1.7.0_79]
at java.net.DatagramSocket.send(DatagramSocket.java:697) ~[na:1.7.0_79]
at org.jgroups.protocols.MPING.sendMcastDiscoveryRequest(MPING.java:295) ~[jar:rsrc:jgroups-3.6.4.Final.jar!/:na]
at org.jgroups.protocols.PING.sendDiscoveryRequest(PING.java:61) [jar:rsrc:jgroups-3.6.4.Final.jar!/:na]
at org.jgroups.protocols.PING.findMembers(PING.java:31) [jar:rsrc:jgroups-3.6.4.Final.jar!/:na]
at org.jgroups.protocols.Discovery.findMembers(Discovery.java:244) [jar:rsrc:jgroups-3.6.4.Final.jar!/:na]
at org.jgroups.protocols.Discovery.down(Discovery.java:387) [jar:rsrc:jgroups-3.6.4.Final.jar!/:na]
at org.jgroups.protocols.MERGE3$InfoSender.run(MERGE3.java:382) [jar:rsrc:jgroups-3.6.4.Final.jar!/:na]
at org.jgroups.util.TimeScheduler3$Task.run(TimeScheduler3.java:287) [jar:rsrc:jgroups-3.6.4.Final.jar!/:na]
at org.jgroups.util.TimeScheduler3$RecurringTask.run(TimeScheduler3.java:321) [jar:rsrc:jgroups-3.6.4.Final.jar!/:na]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_79]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_79]
at java.lang.Thread.run(Thread.java:745) [na:1.7.0_79]

(The exact message differs whether or not the -Djava.net.preferIPv4Stack=true argument is configured)

A configuration that uses MPING also doesn't recover from ifdown/ifup.