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docs: add a note for DNS resolver recommendations (#21250)

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* add a warning to DNS resolver configurations

* Update website/content/docs/services/discovery/dns-configuration.mdx

Co-authored-by: Jeff Boruszak <104028618+boruszak@users.noreply.github.com>

* Update website/content/docs/services/discovery/dns-configuration.mdx

Co-authored-by: Blake Covarrubias <blake@covarrubi.as>

* add references todo

---------

Co-authored-by: Jeff Boruszak <104028618+boruszak@users.noreply.github.com>
Co-authored-by: Blake Covarrubias <blake@covarrubi.as>
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Deniz Onur Duzgun 2024-06-04 17:30:53 -04:00 committed by GitHub
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website/content/docs/services/discovery/dns-configuration.mdx
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@ -33,6 +33,8 @@ You can specify a list of addresses in the agent's [`recursors`](/consul/docs/ag
Nodes that query records outside the `consul.` domain resolve to an upstream DNS. You can specify IP addresses or use `go-sockaddr` templates. Consul resolves IP addresses in the specified order and ignores duplicates.
We recommend that you configure DNS resolvers to point the `consul.` domain towards your Consul DNS servers. Misconfigurations may cause other DNS infrastructure to route queries for the `consul.` domain outside of your network instead, leaking DNS queries to root DNS servers. Refer to [Forward DNS for Consul Service Discovery](/consul/tutorials/networking/dns-forwarding) for instructions.
### Enable non-Consul queries
You enable non-Consul queries to be resolved by setting Consul as the DNS server for a node and providing a [`recursors`](/consul/docs/agent/config/config-files#recursors) configuration.
@ -66,4 +68,4 @@ Responses to pointer record (PTR) queries, such as `<ip>.in-addr.arpa.`, always
### Caching
By default, DNS results served by Consul are not cached. Refer to [DNS caching](/consul/docs/services/discovery/dns-cache) for instructions on how to enable caching.
By default, DNS results served by Consul are not cached. Refer to [DNS caching](/consul/docs/services/discovery/dns-cache) for instructions on how to enable caching.