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86 lines
2.5 KiB
Markdown
Executable File
86 lines
2.5 KiB
Markdown
Executable File
## Setting up better name discovery with Reverse DNS
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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 NetAlertX to execute dig and nslookup commands to automatically resolve device names based on their IP addresses.
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> Example 1: Reverse DNS `disabled`
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>
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> ```
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> jokob@Synology-NAS:/$ nslookup 192.168.1.58
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> ** server can't find 58.1.168.192.in-addr.arpa: NXDOMAIN
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> ```
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> Example 2: Reverse DNS `enabled`
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>
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> ```
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> jokob@Synology-NAS:/$ nslookup 192.168.1.58
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> 45.1.168.192.in-addr.arpa name = jokob-NUC.localdomain.
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> ```
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### Enabling reverse DNS in AdGuard
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1. Navigate to **Settings** -> **DNS Settings**
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2. Locate **Private reverse DNS servers**
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3. Enter your router IP address, such as `192.168.1.1`
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4. Make sure you have **Use private reverse DNS resolvers** ticked.
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5. Click **Apply** to save your settings.
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### Specifying the DNS in the container
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You can specify the DNS server in the docker-compose to improve name resolution on your network.
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```yaml
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services:
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netalertx:
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container_name: netalertx
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image: "ghcr.io/jokob-sk/netalertx:latest"
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restart: unless-stopped
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volumes:
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- /home/netalertx/config:/app/config
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- /home/netalertx/db:/app/db
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- /home/netalertx/log:/app/log
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environment:
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- TZ=Europe/Berlin
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- PORT=20211
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network_mode: host
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dns: # specifying the DNS servers used for the container
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- 10.8.0.1
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- 10.8.0.17
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```
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### Using a custom resolv.conf file
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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](https://www.man7.org/linux/man-pages/man5/resolv.conf.5.html) entry for details.
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#### docker-compose.yml:
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```yaml
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version: "3"
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services:
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netalertx:
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container_name: netalertx
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image: "ghcr.io/jokob-sk/netalertx:latest"
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restart: unless-stopped
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volumes:
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- ./config/app.conf:/app/config/app.conf
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- ./db:/app/db
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- ./log:/app/log
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- ./config/resolv.conf:/etc/resolv.conf # Mapping the /resolv.conf file for better name resolution
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environment:
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- TZ=Europe/Berlin
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- PORT=20211
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ports:
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- "20211:20211"
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network_mode: host
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```
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#### ./config/resolv.conf:
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The most important below is the `nameserver` entry (you can add multiple):
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```
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nameserver 192.168.178.11
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options edns0 trust-ad
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search example.com
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``` |