Sun Cluster HA for DNS Fault Probes

The Sun Cluster HA for DNS fault probe performs an nslookup operation to check the health of the Sun Cluster HA for DNS server. It looks up the domain name of the Sun Cluster HA for DNS logical host from the Sun Cluster HA for DNS server. Depending upon the configuration of your /etc/resolv.conf file, nslookup might contact other servers if the primary Sun Cluster HA for DNS server is down. Thus, the nslookup operation might succeed, even when the primary Sun Cluster HA for DNS server is down. To guard against this, the fault probe verifies whether replies come from the primary Sun Cluster HA for DNS server or other servers.