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DataPower - Active Directory failover using DNS A record that represents multiple IP addresses
We would like DataPower to allow Active Directory failover using DNS A record that represents multiple IP addresses, instead of having to create and maintain dozens of Load Balancer Groups on each appliance (1 per application domain)
IBM Filenet does this, as described by this entry in the IBM FileNet Knowledge Center: https://www.ibm.com/support/knowledgecenter/SSNW2F_5.1.0/com.ibm.p8.security.doc/p8psd005.htm
The following paragraphs are copied from the above link with some slight edits to make them more DataPower applicable.
The benefit of using domain names for failover is that you do not need to modify a failover list (Load Balancer Group) when you decommission a domain controller or change its host name. Instead, the DNS data will be updated by the DNS Server, and DataPower could (if this RFE was implemented) read the latest DNS data when it needs to fail over to another domain controller.
A DNS A (address) record is a DNS record that associates a DC or GC host name with one or more IP addresses. For example, you could create an A record named my_dc that will associated with three local domain controllers: 22.214.171.124, 126.96.36.199, and 188.8.131.52.
In some cases, this method is preferable to the Load Balancer Group method. For example, if you have many applications communicating with many directory servers and a directory server is decommissioned or its host name is changed, you remove it from the DNS server and all applications will use the updated DNS data to perform failover. No application restart is necessary. You can maintain a list of directory servers that is associated to a DNS name on your DNS server. All applications point to this DNS name instead of specific server names. The DNS name can be either an AD domain name or an arbitrary host name that is associated to multiple IP addresses of AD servers.
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