Hello, was my fault. I had iptables running with wrong configuration. I allowed input traffic (output traffic is not filtered) like: iptables -I INPUT -s XXX.XXX.XXX.0/24 -j ACCEPT After adding a LOG target to iptables I found dropped IGMP-packets with SRC 0.0.0.0 and DST: 224.0.0.1 After adding the following rule (found in Doc "Cluster Administration") error messages are gone : iptables -I INPUT -p igmp -j ACCEPT Thanks again. Ralf -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
