Minimum TTL?

Barry Margolin barmar at alum.mit.edu
Thu Feb 8 16:03:40 UTC 2018


In article <mailman.427.1518103401.749.bind-users at lists.isc.org>,
 Reindl Harald <h.reindl at thelounge.net> 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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