Hi all, I´m testing a 2 nodes cluster with 2 xen virtual machines running on a Xen host. I have the cluster running and I want to configure fence_xvm. I have followed the instructions of this page: <a href="http://sources.redhat.com/cluster/wiki/VMClusterCookbook">http://sources.redhat.com/cluster/wiki/VMClusterCookbook</a> but when I reach at the point of running this command: cluster]# fence_xvmd -fdddd Debugging threshold is now 4 -- args @ 0xbfd38f08 -- args->addr = 225.0.0.12 args->domain = (null) args->key_file = /etc/cluster/fence_xvm.key args->op = 2 args->hash = 2 args->auth = 2 args->port = 1229 args->ifindex = 0 args->family = 2 args->timeout = 30 args->retr_time = 20 args->flags = 1 args->debug = 4 -- end args -- Reading in key file /etc/cluster/fence_xvm.key into 0xbfd37f08 (4096 max size) Actual key length = 4096 bytesOpened ckpt vm_states Setting up ipv4 multicast receive (<a href="http://225.0.0.12:1229">225.0.0.12:1229</a>) Joining multicast group Failed to bind multicast receive socket to <a href="http://225.0.0.12">225.0.0.12</a>: No such device Check network configuration. Could not set up multicast listen socket I don´t understand what I have to do to make this work. (I´m newbie to this kind of fence method, perhaps is a stupid thing.) any clue? thanks in advance ESG