[DNSfirewalls] RPZ Trigger on answer section

Davey Song songlinjian at gmail.com
Mon Dec 25 02:07:06 UTC 2017

On 24 December 2017 at 02:12, Paul Vixie <paul at redbarn.org> wrote:

> RPZ is not able to act on two or more attributes of a response, only one.
> None of the relevant attributes will be the QTYPE of the query or any of
> the RRTYPEs of the answer. so, as it is today, RPZ cannot help you with
> your problem.

Yes, I see that.

you are correct that there is no trigger in RPZ that does what you need.
> moreover, there may not be anything in DNS that does what you need. the
> CNAME returned in the CDN IP4 case will be cached, and your authority
> server will not receive subsequent queries about any RRset for that alias
> (CNAME owner). so, even if you use dnsdist, or hand-write your own DNS
> server, it's not clear that you could ever win.

I think even if A records is cached (from cname server), the AAAA query
will still sent to the authority server. No AAAA in the cache.

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