Option to disable cahing of SERVFAIL responses

[gshpychka]

Prerequisites

• [X] I have checked the Wiki and Discussions and found no answer

• [X] I have searched other issues and found no duplicates

• [X] I want to request a feature or enhancement and not ask a question

The problem

I would like to be able to disable the cahing of SERVFAIL responses by adguard.

Proposed solution

A configuration option to disable the caching of SERVFAIL requests and/or treat it as a failure

Alternatives considered and additional information

It has been stated in https://github.com/AdguardTeam/AdGuardHome/issues/5924 that this is intended behavior, but the spec does not require the server to do this. So I'm asking for the ability to disable it.

Related: https://github.com/AdguardTeam/AdGuardHome/issues/7292

[masx200]

[gshpychka]

I'm afraid I don't speak Chinese - what is your screenshot showing?

[masx200]

I'm afraid I don't speak Chinese - what is your screenshot showing?

Because tailscale's dns server "100.100.100.100" gets an error servfail。

When the tailscale dns service is used with adguardhome, the network becomes a disaster!

https://github.com/tailscale/tailscale/issues/13925