[dnsdist] Rule for lowering the TTL for a specific qname with qtype TXT

[Otto Moerbeek]

Hello

and AndRule is one possible approach, but if you use a packet cache,
you can also set maxNegativeTTL. This TTL will be used then for all
NXDomain or NoData answers.
See https://www.dnsdist.org/reference/config.html#packetcache

And AndRule would look like

addResponseAction(AndRule{...}, ...)

	-Otto

On Tue, Sep 23, 2025 at 07:14:36AM +0200, Tom via dnsdist wrote:

> Hi list
> 
> I'm struggling with implementing the following dnsdist rule/behavior:
> If...
> a) qname starts with "_acme-challenge" AND
> b) qtype is TXT AND
> c) RCODE is NXDOMAIN
> then
> lower the response TTL to 30s.
> 
> What's the best way to achieve this? With a LUA rule or perhaps with
> "addAction(AndRule..."?
> 
> Thanks in advance for any hints.
> Tom
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