An "A" record needs to be created for each IP address that the host uses.
For example, you have a server whose DNS host name is <myserver> and DNS domain name is <mydomain.com>. This server has 2 IP addresses assigned
to it: IPAddress1 and IPAddress2 (replace IPAddress1 and IPAddress2 with server's IP addresses).
The related KB:
Creating a DNS Record for a Host with Two or More IP Addresses
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