[lug] DNS Time

[Shannon M. Johnston]

How do I reduce the TTL time?

"Jeffrey B. Siegal" wrote:

> "Shannon M. Johnston" wrote:
> > What gives?
>
> Two things:
>
> 1. The TTL value in the records themselves.
>
> 2. The refresh time for the secondary name servers (not an issue with newer
> name server code, because it will probe the secondaries to get them to reload
> when you update the primary).
>
> The default for both of these is set in the SOA record.
>
> The key to moving something and not having to way for the changes to propogate
> is to reduce the TTL and refresh time *before* the move down to something very
> low, like five minutes.  Then wait for the old data to age out (which could
> take a day or two).  Then move the stuff, update the DNS, and increase the TTL
> and refresh back up to a reasonable level (24 hours+).  Since the data being
> cached when you do the move has five minute timeouts, everything should be
> updated within five minutes, worldwide.
>
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