Round robin is having the same A record for multiple IP addresses.
cyclic/round robin works for any type of DNS records in any record set.
eg, see the AOL MX's. They have multiple MX records, and for each MX hostname, they have multiple A records. ie, two levels of record sets, both order-cycling.
I will have to get my DNS book out to get the exact action for multiple MX records with same priority.
they will be, depending on the DNS server configuration, returned from the DNS in cyclic/random/fixed order (for BIND, the rrset-order sub-statement).
Note that AOL doesn't depend completely on DNS for load distribution, but also uses a global load balancing. You will see A records disappear from record sets as the load balancer decides that an A record's box is too busy.
Len
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