default local DNS caching name server
bjorn at xn--rombobjrn-67a.se
Sun Apr 13 13:52:52 UTC 2014
William Brown wrote:
>In businesses, it's also common place to have a low-ish ttl (Say 5
>minutes) and when a system is migrated, they swap the A/AAAA records to
>the new system. The dns servers on the network are updated, but the
>workstation has the old record cached. Without a local cache, they
>would query the local server again, which is relatively cheap. IE: It
>keeps users happier even if they only needed to wait 5 minutes. Some
>people like things to be instant.
If the admins on that network configured a five-minute TTL, it's because
they *want* the clients to cache the records for five minutes. They can
set the TTL to zero if they want the servers to be queried for every
And if they're migrating a system they will know this more than five
minutes in advance, so they can set a zero TTL temporarily.
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