On 22 Aug 2013, at 10:49, Phil Mayers wrote: > * Make the service name a CNAME into another small dynamic (sub-)zone. This is what most DNS-based LB do e.g. www.example.com CNAME www.lb.example.com, then make "lb.example.com" a small, dynamically-updated zone. or delegate www.example.com as a tiny dynamic zone and update it directly. Niall O'Reilly