On 7 Jun 2005, at 16:03, Edward Lewis wrote:
As you descend the tree, it's clearer than spreading name servers among domains (even different tlds) has a benefit.
I'm reading that as "... clear that ..." rather than "... clearer than ...", as I can't make sense of it otherwise. I used to think so too, but I'm now convinced that this is not clear at all. I'm not saying it's necessarily untrue (or even true): just that it's not clear.
Because there are more moving parts as you descend the tree, there's more chance something goes wrong, so you want to build in resiliency.
Spreading name servers among domains _may_ give resiliency; it _certainly_ adds complexity and expands the repertoire of potential failure modes. There are more places where things can go wrong. If there are (perhaps hidden) interdependencies between these places, the overall impact of one particular thing going wrong may be far greater than expected. It all depends on having a strategy for placing your servers in well-managed parts both of the DNS tree and of the network topology. Of course, we all take care to have a strategy we can stand over, and to review it regularly! 8-) /Niall