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Okay, so multicast works, but only if I manually specify the multicast address 224.0.0.1 omping -m 224.0.0.1 node1 node2 But what I get when I run corosync-cmapctl -g totem.interface.0.mcastaddr is totem.interface.0.mcastaddr (str) = 239.192.23.137 EDIT: Fix was simple, I just added a...

Multicast was working for me until I ran a package update yesterday and rebooted one of the nodes in a two-node cluster (start of a bigger cluster) and when it came back up I couldn't get it joined back into the cluster until I switched to unicast in corosync.conf. Still investigating, but it's...