Is there any reason or advantage to use multicast over broadcast, which offsets the complexity of multicast (relative to broadcast), e.g more control, less traffic, others? The documentation is not very helpful. The RHCS 4 manual just says "choose one". The RHCS 3 manual section 3.6.1 says "Multicast heartbeating over a channel-bonded Ethernet interface provides good fault tolerance and is recommended for availability." This looks more like a recommendation of channel-bonding versus standalone interfaces than recommending multicast over broadcast, since fault tolerance and availability are offered by channel-bonding, not multicast. -- Riaan van Niekerk Systems Architect Obsidian Red Hat Consulting Obsidian Systems www.obsidian.co.za Cel: +27 82 921 8768 Tel: +27 11 792 6500 Fax: +27 11 792 6522 -- Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster