If you are having problems with the default multicast address 239.192.x.x it is probably because your switch is not sending those packets because of a configuration issue. If you have this problem please contact me. I would like to make a cookbook of switch manufacturer/models and possible solutions. Using 224.0.0.x is not recommended as these multicast packets are broadcoast over the network. Regards -steve -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster