PTR queries for DHCP clients aren't being affected by filtering rules

[agneevX]

Prerequisites

• [x] I am running the latest version
• [x] I checked the documentation and found no answer
• [ ] I checked to make sure that this issue has not already been filed

Issue Details

• Version of AdGuard Home server:
  • 0.106.3
• How did you install AdGuard Home:
  • Docker
• How did you setup DNS configuration:
• If it's a router or IoT, please write device model:
• CPU architecture:
  • arm64
• Operating system and version:
  • Ubuntu 20.04

Issue Details

I've created a rule that blocks PTR queries for my local network range.

However, some queries are still being answered:

Additional Information

Seems like it replies to queries when AGH is used as DHCP.

[ainar-g]

Hm. If I recall correctly, PTR queries for IPs within locally served networks are processed before most of the filtering takes place. @EugeneOne1, please confirm.

@ameshkov, do we need an ability to filter out certain PTR requests within the locally served network?

[EugeneOne1]

@ainar-g, yeah, all the PTR requests for private/local IPs (including DHCP leased) aren't filtered at all.

[ainar-g]

@ameshkov, ping?

[ameshkov]

Probably, but with a very low priority IMO