DNS Server Status via SNMP

The Oracle® Enterprise Session Border Controller monitors the status of all configured DNS servers used by a SIP daemon. If a DNS server goes down, a major alarm is sent. If all DNS servers used by a SIP daemon are down, a critical alarm is sent. The apAppsDnsServerStatusChangeTrap is sent for both events.

You can poll the status of a DNS server using the apAppsDNSServerStatusTable in the ap-apps.mib.

Once the apAppsDnsServerStatusChangeTrap has been sent, a 30 second window elapses until the server status is checked again. At the 30 second timer expiration, if the server is still down, another trap and alarm are sent. If the server has been restored to service, the apAppsDnsServerStatusChangeClearTrap is sent.