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DOCS: subnets

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Signed-off-by: jokob-sk <jokob.sk@gmail.com>
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docs/SUBNETS.md
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@@ -8,8 +8,14 @@ You need to specify the network interface and the network mask. You can also con
> If you don't see all expected devices run the following command in the NetAlertX container (replace the interface and ip mask):
> `sudo arp-scan --interface=eth0 192.168.1.0/24`
>
> If this command returns no results, the network is not accessible due to your network or firewall restrictions (Wi-Fi Extenders, VPNs and inaccessible networks). If direct scans are not possible, check the [remote networks documentation](./REMOTE_NETWORKS.md) for workarounds.
> If this command returns no results:
>
> - ✅ If you see output like `IPv4: (none)` or `Using 0.0.0.0`:
> → The interface was not detected correctly.
> → Fix: explicitly set the interface using `--interface=<name>`.
>
> - ❌ If the scan runs correctly but still finds no devices:
> → The network may not be accessible due to firewall, VLAN, or network restrictions (Wi-Fi extenders, VPNs, etc.). If direct scans are not possible, check the [remote networks documentation](./REMOTE_NETWORKS.md) for workarounds.
## Example Values