Novell SUSE LINUX ENTERPRISE SERVER 10 SP2 HEARTBEAT Manual page 27

Figure 2.3 Media Configuration
This provides a way for cluster nodes to signal that they are alive to other nodes
in the cluster. For proper redundancy, you should specify at least two Heartbeat
media if possible. Choose at least one Heartbeat medium, and if possible, more
than one:
• If you choose Broadcast, select one of the available network devices in the
Device list.
• For Multicast, choose a network Device, Multicast Group to join (class D
multicast address 224.0.0.0 - 239.255.255.255) and the TTL value (1-255).
UDP Port sets the UDP port that is used for the broadcast media. Leave this set
to the default value (694) unless you are running multiple Heartbeat clusters on
the same network segment, in which case you need to run each cluster on a dif-
ferent port number.
Installation and Setup 19