[dnsdist] Caching reverse lookups
radelj at folioinvesting.com
Tue Mar 19 21:02:52 UTC 2019
On 3/19/19 4:56 PM, Alan Clegg wrote:
> On 3/19/19 4:51 PM, Jon Radel wrote:
>> To add a bit more information: It turns out to matter how I do the
>> query. If I do the query using dig 9.11.3 as shipped with Ubuntu, it
>> doesn't get cached. If I do the query with host, it does get cached.
>> Which lead me to the thought that being a bit less clever with dig
>> options might help. With the +noedns flag, bind queries are also cached.
>> I'd love an explanation of why this is.
> DNS Cookies. https://tools.ietf.org/html/rfc7873
Ah, indeed the +nocookie flag on bind is sufficient to change the
behavior. What value is there to caching the response in this case? I
would hope that cookie values wouldn't repeat often enough to make
caching of value.
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