NetAlertX/docs/REVERSE_DNS.md

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 comamnds 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.