Certain clients are “dumb” and always connect to first IP address or name found in a DNS answer received from resolver intead of picking randomly. As a workaround for such broken clients it is possible to randomize order of records in DNS answers sent by resolver:
reorder_RR([true | false])¶
new_value (boolean) –
trueto enable or
falseto disable randomization (optional)
The (new) value of the option
If set, resolver will vary the order of resource records within RR sets. It is enabled by default since 5.3.0.