By Brian Turner Ottosen - I was wondering happens when one caching name server gets an answer from another in terms of TTL.

Let's imagine a zone file with TTL of 900 seconds (15 minutes)

I guess in a normal situation a client asks NS A who immediately asks NS B who immediately asks NS C etc.

If each of them are told to only keep the data for 15 minutes they will run out about the same time.

But what if NS D asks NS C after 14 minutes just before the time is up?

Will NS D keep the data for another 15 minutes? This way the zone could theoretically jump from server to another for ever.

....or will NS D receive the data with a TTL of 1 minute?

Brian.

Brian Turner Ottosen

Managing Director

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