In article <[email protected]>,
 Hongyi Zhao <[email protected]> wrote:

> In addtition, I also want to have long TTL so that I can obtain a short
> inquiry respond time.

You can't. If a domain operator wants his changes to propagate quickly 
(like when moving to a new hosting provider, or if using DNS for 
failover), he has to be able to set a small TTL, and depend on the fact 
that everyone will obey it.

You can set a maximum TTL, but there's no minimum TTL.

-- 
Barry Margolin
Arlington, MA
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