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REVERSE_DNS.md

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Important

⚠ This is a public archive and the active project has been renamed to NetAlertX and moved: jokob.sk/NetAlertX

  • To differentiate from the upstream stale project
  • To differentiate from other active forks
  • To indicate this is not a Raspberry Pi-specific tool anymore

Setting up better name discovery with Reverse DNS

If you are running a DNS server, such as AdGuard, set up Private reverse DNS servers for a better name resolution on your network. Enabling this setting will enable PiAlert to execute dig and nslookup commands to automatically resolve device names based on their IP addresses.

Example 1: Reverse DNS disabled

jokob@Synology-NAS:/$ nslookup 192.168.1.58
** server can't find 58.1.168.192.in-addr.arpa: NXDOMAIN

Example 2: Reverse DNS enabled

jokob@Synology-NAS:/$ nslookup 192.168.1.58
45.1.168.192.in-addr.arpa       name = jokob-NUC.localdomain.

Enabling reverse DNS in AdGuard

  1. Navigate to Settings -> DNS Settings
  2. Locate Private reverse DNS servers
  3. Enter your router IP address, such as 192.168.1.1
  4. Make sure you have Use private reverse DNS resolvers ticked.
  5. Click Apply to save your settings.

Using a custom resolv.conf file

You can configure a custom /etc/resolv.conf file in docker-compose.yml and set the nameserver to your LAN DNS server (e.g.: Pi-Hole). See the relevant resolv.conf man entry for details.

docker-compose.yml:

version: "3"
services:
  pialert:
    container_name: pialert
    image: "jokobsk/pi.alert:latest"
    restart: unless-stopped
    volumes:
      - ./config/pialert.conf:/home/pi/pialert/config/pialert.conf
      - ./pialert_db:/home/pi/pialert/db
      - ./log:/home/pi/pialert/front/log
      - ./config/resolv.conf:/etc/resolv.conf                          # Mapping the /resolv.conf file for better name resolution
    environment:
      - TZ=Europe/Berlin
      - PORT=20211
    ports:
      - "20211:20211"
    network_mode: host

./config/resolv.conf:

The most important below is the nameserver entry (you can add multiple):

nameserver 192.168.178.11
options edns0 trust-ad
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