Novell SUSE LINUX ENTERPRISE SERVER 10 SP2 HEARTBEAT Manual page 26

3 On the Authentication Keys screen, specify the authentication method the cluster
Figure 2.2 Authentication Keys
4 On the Media Configuration screen, specify the method Heartbeat will use for
18 Heartbeat
will use for communication between cluster nodes, and if necessary an Authenti-
cation Key (password). Then click Next.
Both the MD5 and SHA1 methods require a shared secret, which is used to protect
and authenticate messages. The CRC method does not perform message authen-
tication, and only protects against corruption, not against attacks.
The SHA1 method is recommended, because it provides the strongest authenti-
cation scheme available. The authentication key (password) you specify will be
used on all nodes in the cluster.
When running this installation program on the other cluster nodes, you should
choose the same authentication method for all nodes.
internal communication between cluster nodes. This configuration is written to
/etc/ha.d/ha.cf.