Create vlans.md

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Update vlans.md

Specified the current guide only applies to installations utilizing `dhcpcd`, not newer versions using `NetworkManager`.

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Update docs/guides/misc/vlans.md

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docs/guides/misc/vlans.md

@@ -0,0 +1,72 @@
+# VLANs and virtual LAN interfaces
+
+This guide will help you configure Pi-hole to operate across defined virtual LAN interfaces on networks with VLANs configured.
+
+## Notes & Warnings
+
+- This guide is only applicable to distributions using `dhcpcd`, not those utilizing `NetworkManager` or `systemd-networkd.
+- This guide should only be used by users with advanced networking knowledge with networks utilizing VLAN configurations.
+- Opening up ports for devices on insecure networks can be dangerous, proceed with caution.
+- If you want the device to have static IP addresses or other further network routing configurations, those steps would need to be added based on your specific network setup and requirements.
+
+## Setup VLANs
+
+### Install `vlan` Package
+
+```
+sudo apt install vlan
+```
+
+### Configure VLAN interfaces
+
+Create network interface configuration file for vlans
+
+```
+sudo nano /etc/network/interfaces.d/vlans
+```
+
+Add the following for each vlan interface you would like to add, replacing the `<>` brackets:
+
+```
+auto <interface>.<vlan id>
+iface <interface>.<vlan id> inet manual
+  vlan-raw-device <interface>
+```
+
+For example, configuring VLAN id 8 and 16 on interface eth0 should look like:
+
+```
+auto eth0.8
+iface eth0.8 inet manual
+  vlan-raw-device eth0
+
+auto eth0.16
+iface eth0.16 inet manual
+  vlan-raw-device eth0
+```
+
+### Restart and test
+
+Restart Device Networking
+
+```
+sudo systemctl restart networking
+```
+
+Test config for an IP in each VLAN
+
+```
+hostname -I
+```
+
+Example output:
+
+```
+192.168.1.100 192.168.8.1 192.168.16.1
+```
+
+### Configure Pi-hole to Listen on the VLAN Interfaces
+
+1. Go to the [Pi-hole admin dashboard](http://pi.hole/admin/)
+2. Navigate to **Settings** > **DNS**
+3. Under **Interface listening behavior**, choose **Listen on all interfaces** or **Permit all origins** depending on your security preference. More information about these settings can be found [here](https://docs.pi-hole.net/ftldns/interfaces/).

mkdocs.yml

@@ -179,6 +179,7 @@ nav:
         - 'Troubleshooting': guides/vpn/openvpn/troubleshooting.md
     - 'Misc':
       - 'Benchmarking': guides/misc/benchmark.md
+      - 'VLANs': guides/misc/vlans.md
       - 'Tor & Pi-hole':
         - 'Overview': guides/misc/tor/overview.md
         - 'Basic Setup': guides/misc/tor/setup.md