[Pdns-users] Remote Backend and Query / Packet Cache

Aki Tuomi cmouse at youzen.ext.b2.fi
Sun Feb 1 08:14:56 UTC 2015

On Sun, Feb 01, 2015 at 02:41:07AM +0000, AJ McKee wrote:
> Being the weekend, I decided to write a HTTP backend for pdns as a fun
> thing to do.
> One thing springs to mind however are the packet and query cache. In
> particular, how they cache.
> Do they use the remote clients ip as part of the caching key, thus only
> serving from the cache if the client is repeatedly asking? AFAIK this is
> not the case.
> If I added simple bind style views to my backend, would this be pointless?
> My thinking here, if a request came from netblock A and it was cached,
> followed by a request from netblock C, C would get the cached answer
> instead of querying the backend for its corrected view.
> Is there a way that the remote backend can influence the cache in the
> response it sends back?
> I am aware of all the other backend, this is just my fun-time thing to play
> with the new features.
> Thanks in advance
> -- 
> AJ McKee
> phone: +353 83 1130 545
> profile:  http://linkedin.com/in/ajmkee
> jid:       aj.mckee at druid-dns.com
> blog:    http://aj.mc-kee.com/
> twitter: @ajmckee

You can set scopeBits to size of netblock. Should do what you 


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