Minimum TTL?

Barry Margolin barmar at
Thu Feb 8 16:03:40 UTC 2018

In article <mailman.427.1518103401.749.bind-users at>,
 Reindl Harald <h.reindl at> wrote:

> frankly, even *if* i pay for the service i would call it a good citizen 
> to produce less load and the "minimum-ttl" also reduces load from other 
> RBL's without any restriction

If the service provider is worried about load, they should increase 
their TTL to reduce the frequency of queries. It's not your job to 
second-guess them.

There are some servers that will avoid expiring records if the auth 
servers stop responding, as a fail-safe mechanism. I think Google Public 
DNS does this. So they obey TTL when deciding when to try to refresh the 
cache, but will continue returning whatever they've cached if necessary.

Barry Margolin
Arlington, MA

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