> www   IN      CNAME   12.34.56.78
> www   IN      CNAME   9.10.11.12
> www   IN      CNAME   65.4.3.21

Those should be 'A's. And you propably want a *short* livetime.

> The DNS standard will give out a different address for every

This is a particular feature of ICS (www.isc.org) their BIND named
distribution; not part of any standard.

You propably also want to look at Dynamic DNS update or Secure Dynamic DNS
update in conjuction with snmp or some other actiev probing; as to mask
out non responding addresses within a few time-to-live intervals. Typical
propbing rates are livetime/2 sort of rates.

Dw


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