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Pull request 183: doc ds upstream config 

Merge in GO/adguard-home-wiki from doc-ds-upstream-config to master

Updates AdguardTeam/AdGuardHome#6156.

Squashed commit of the following:

commit cabb4325803ebdb51ff3a749c0b788e62e03b1ee
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Oct 12 18:03:52 2023 +0300

    Configuration: screen spec chars

commit f3de47b618166d1ca407bd55e7b0945016407393
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Oct 12 17:59:03 2023 +0300

    Configuration: imp txt

commit 52c43fa8e4f14db15ad3457a40f6e5c346f9780e
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Oct 12 17:48:19 2023 +0300

    Configuration: mention ds
Eugene Burkov 2023-10-12 18:17:02 +03:00
parent 0dd45291ac
commit fc96870efc
1 changed files with 12 additions and 0 deletions
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12
Configuration.md

@ -151,6 +151,18 @@ a configuration like this:
sends queries for `*.host.com` to `1.2.3.4` except for queries for sends queries for `*.host.com` to `1.2.3.4` except for queries for
`*.www.host.com`, which are sent to `6.7.8.9`, which is the default upstream. `*.www.host.com`, which are sent to `6.7.8.9`, which is the default upstream.
Queries for the `DS` query type are following the assumption based on
specification for records' presence given in [RFC 4035, section
2.4](https://datatracker.ietf.org/doc/html/rfc4035#section-2.4):
> A DS RRset SHOULD be present at a delegation point when the child zone is
> signed. \[…\] All DS RRsets in a zone MUST be signed, and DS RRsets MUST
> NOT appear at a zone's apex.
For example, the `DS` query for `domain.example.com` will be sent to the
upstream specified for `example.com`, `com`, or the default one, even if there
is a more specific upstream like `*.example.com`.
Since **v0.108.0-b.8** the wildcard `*` has a special meaning of "any Since **v0.108.0-b.8** the wildcard `*` has a special meaning of "any
subdomain", so `--upstream=[/*.host.com/]1.2.3.4` will send queries for subdomain", so `--upstream=[/*.host.com/]1.2.3.4` will send queries for
`*.host.com` to `1.2.3.4`, but `host.com` will be forwarded to default `*.host.com` to `1.2.3.4`, but `host.com` will be forwarded to default