Robert Elz writes:
> allows significant caching benefits
Do you have some numbers to back that up? How many DNS queries does your
site generate? How many of them would have been saved by this type of
overlap? Assume that networks are marked by in-addr.arpa zones. Ignore
the extra cost of following out-of-zone pointers.
> The same applies to NS records, MX records, etc
I've reviewed the logs on a busy mail server. The overlap is negligible.
Yes, there are quite a few high-TTL MX/NS records pointing to low-TTL A
records, but only a small fraction of the A owners are shared by other
MX/NS records.
---Dan
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