[dns-operations] resolver cache question
mallman at icsi.berkeley.edu
Tue Nov 17 21:28:43 UTC 2020
>>  https://www.sciencedirect.com/science/article/abs/pii/S1389128620312627
> This is a network security paper, not a systems engineering
> paper. The authors are primarily concerned with the storage
> requirements of systems that store DNS data well beyond the
> nominal TTL of the RRsets, which they want to reduce by filtering
> out "disposable" records.
Sure. There are multiple goals. The logging goal is a little weird
as motivation to my eye. In any case, there are other papers, too.
> As far as detecting whether "clogging" of DNS resolver caches
> occurs, it probably would make sense to have resolvers increment a
> "premature expiration" counter when they expire cache entries
> prior to the scheduled TTD of the cached RRset or cached
> message. This would allow operators to provide feedback to
> resolver developers as to whether this behavior is actually
> occurring in the real world. (Looking at the unbound-control
> manpage I don't think unbound has such a metric, not to pick on
I was sort of hoping this kind of thing was logged and folks could
give me a clue with actual data. Seems like a natural thing to log.
But, I guess not. Or, maybe folks are not willing to share.
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