**Purpose**:
You may find that you only have one network adapter on a server / VM and need to have multiple virtual networks associated with it.  For example, Home Assistant exists on the `192.168.3.0/24` network but it needs to also access devices on the `192.168.4.0/24` surveillance network.  To facilitate this, we will make a MACVLAN Sub-Interface.  This will make a virtual interface that is parented to the actual physical interface.

!!! info "Assumptions"
    It is assumed that you are running Rocky Linux (or CentOS / RedHat).

## Create the Temporary Interface
You will begin with making a new interface, it will have the name `macvlan0`.
``` sh
ip link add macvlan0 link eno1 type macvlan mode bridge
ip addr add 192.168.4.100/24 dev macvlan0
ip link set macvlan0 up
```

## Bind a Docker Network to the Sub-Interface
Now you need to run the following command to allow docker to use this interface for the `surveillance_network`
``` sh
docker network create -d macvlan --subnet=192.168.4.0/24 --gateway=192.168.4.1 -o parent=macvlan0 surveillance_network
```

!!! warning "Not Reboot-Persistent Yet"
    Unfortunately due to a lack of documentation yet, I do not have a permanent configuration change to make this persistent, as such, you will need to re-run the commands above (at least the "Temporary Interface" section) in order to get it operational again after a system reboot.