Resolve unqualified requests for local hostnames (AGH as DHCP server)

[jwyse]

I can successfully resolve DHCP-assigned local hostnames like computer1.mylan, but I would like to also resolve computer1 the same way (I want to assume/append .local_domain_name for any unqualified requests). I can't seem to get that to work, and I'm probably just not searching the docs for the correct terminology.

I'm new to AdGuardHome, and I'm migrating DNS and DHCP duties from Pi-Hole to AGH. I'm running AGH in a Docker container at 192.168.1.8 and have it configured as the DHCP server for the network, with several static leases. I have my local domain configured:

# AdGuardHome.yaml
dhcp:
  local_domain_name: mylan

I currently have a simple upstream DNS configuration:

1.1.1.1
1.0.0.1

I have tried variations of the below in upstream DNS configuration, but I'm guessing that is causing a recursive loop/timeout.

[/mylan/]127.0.0.1
[//]127.0.0.1

$ nslookup computer1
# Server:  UnKnown
# Address:  192.168.1.8  # This is my AGH server

# DNS request timed out.
#     timeout was 2 seconds.
# DNS request timed out.
#     timeout was 2 seconds.
# *** Request to UnKnown timed-out

Most of my searches yield documentation and posts about how to solve this by pointing to a router or some other DHCP server, but I can't seem to find a resolution for using AdGuardHome's DHCP server. Thanks in advance for any help.

[schzhn]

Try adding the following DHCP options to the configuration file:

dhcp:
  # ...
  dhcpv4:
    # ...
    options:
      - 15 text mylan
      - 119 text mylan

[jwyse]

@schzhn Thanks for the reply. If I'm reading the RFC2132 doc correctly for option 15:

This option specifies the domain name that client should use when resolving hostnames via the Domain Name System.

That sounds like it's going to give DHCP clients a hint for querying DNS, but won't help any DNS clients that have manual IP address settings, right? Is there a setting on the DNS side of AdGudard Home that will append the local domain name to any unqualified requests? Thanks!!

[schzhn]

You can apply a custom filtering rule:

||computer1^$dnsrewrite=1.2.3.4

[schzhn]

or

||computer1^$dnsrewrite=computer1.mylan

with

[/mylan/]127.0.0.1

[jwyse]

Is there a solution that doesn't require manually adding custom filter rules for every host on my network? I used computer1 as a placeholder/example, but ideally I'd like an approach that will work with any hostname on my network.