Force TTL on a Caching Name Server

howting at howting at
Fri Sep 8 00:03:55 UTC 2006

> Hmm... OK. So if one of your users really likes Hemis (TM) and hits
> frequently during the course of a day, you
> think it's "perfect" for your nameserver to be querying mine 12 times as
> often as it should be expected to (the TTL I've set on the RRset is 1
> hour, but you're capping it at 5 minutes)? That's an interesting
> definition of "perfect". It's certainly not "perfect" from the
> perspective of my traffic load, my capacity planning for the future, my
> budget, etc.

The solution is by no means perfect for everyone, and definitely not
good for a typical caching nameserver. We run a monitoring application
so we must do a fresh DNS lookup often in order to make sure DNS
servers are working. It is a unique requirement.

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