The procedure to configure primary and secondary DNS server may vary depending on the host operating system of the external XMPP server.
If the external XMPP server resides in one of the data centers:
The XMPP server must be configured with two DNS servers.
The DNS local to the data center should be configured as primary DNS and the DNS of the other data center should be configured as secondary or alternate DNS sever.
If the external XMPP server is deployed outside both data centers, then select one of the following as applicable to the network deployment:
The XMPP server must be configured with a DNS external to both data centers.
The XMPP server must be configured with DNS from one of the data center as primary and the DNS from other data center as secondary.
