As was previously mentioned, you need to be more clear about what
you're asking. There are multiple related concepts. Look up a
description of the SOA record, in particular the refresh, retry,
expire, and minimum TTL fields. The first three affect how DNS
secondary servers behave. The last can affect client responses,
but you can also have per-record TTL values and zone default TTL
values.
This link might be a good starting point for understanding the
SOA parameters: <http://rscott.org/dns/soa.html>
If you're trying to solve a problem with DNS secondaries keeping
up, watch that you're incrementing the serial number. If you're
using split zones (views) or other esoteric configurations, things
get a whole lot more complicated.
--
Everyone has a photographic memory. Some don't have film.
- Steven Wright
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