Connecting Two Networks

Chapter 5 — Connecting Two Networks

5.1 Why Two Network Connections Are Necessary

The Vantrue F1 motorcycle camera creates its own Wi-Fi network. It does not join an existing home Wi-Fi network.

This means a phone or computer must connect directly to the camera's network to communicate with it.

Our objective was to let the Mac mini connect to the camera while remaining accessible from other devices inside the house.

We accomplished this using two network interfaces:

• Wi-Fi: Connects the Mac mini to the Vantrue F1.
• Ethernet: Connects the Mac mini to the home network through a Wi-Fi extender with an Ethernet port.

The Mac mini participates in both networks. It is not necessary to configure it as an internet router or enable Internet Sharing.

5.2 The Network Layout

       MOTORCYCLE / GARAGE
       ┌─────────────────┐
       │   Vantrue F1    │
       │ Wi-Fi Access Pt │
       └────────┬────────┘
                │
          Camera Wi-Fi
                │
       ┌────────▼────────┐
       │  2012 Mac mini  │
       │                 │
       │ Wi-Fi: Camera   │
       │ Ethernet: Home  │
       └────────┬────────┘
                │
             Ethernet
                │
       ┌────────▼────────┐
       │  Wi-Fi Extender │
       │  Ethernet Port  │
       └────────┬────────┘
                │
          Home Wi-Fi
                │
       ┌────────▼────────┐
       │   Home Router   │
       └────────┬────────┘
                │
       ┌────────▼────────┐
       │  MacBook Air    │
       │  iPad / iPhone  │
       └─────────────────┘

5.3 Prepare the Home Network Connection

Our garage did not require a new Ethernet cable run back to the house.

Instead, we used a Wi-Fi extender with an Ethernet port.

The extender connects wirelessly to the home network and provides a wired network connection for the Mac mini.

To configure this arrangement:

1. Set up the extender according to its manufacturer's instructions.
2. Confirm that the extender has joined the home Wi-Fi network.
3. Connect an Ethernet cable from the extender to the Mac mini.
4. On the Mini, open System Preferences → Network.
5. Select Ethernet.
6. Confirm that it reports a connected status and has received an IP address.

The extender must support an operating mode in which its Ethernet port connects a wired device to the existing home network. Not all extender configurations behave identically.

5.4 Test Ethernet Before Connecting to the Camera

Before connecting the Mini to the F1, verify that Ethernet works independently.

1. Temporarily disconnect the Mini from Wi-Fi.
2. Confirm that Ethernet remains connected.
3. Open Safari and test access to a trusted website.
4. Confirm that another Mac on the home network can reach the Mini, if file sharing has already been configured.

This establishes that the home-network path works without relying on the Mini's Wi-Fi connection.

If Ethernet does not work, resolve that problem before proceeding.

5.5 Connect the Mini to the Vantrue F1

1. Supply electrical power to the F1 and activate its Wi-Fi according to the camera's instructions. The motorcycle engine does not necessarily need to be running; what matters is that the camera has power and its Wi-Fi is enabled. Follow the motorcycle and camera instructions for supplying power, and be mindful of battery use while the engine is off.
2. On the Mac mini, open the Wi-Fi menu.
3. Locate the F1's broadcast Wi-Fi network.
4. Select it.
5. Enter the camera's Wi-Fi password.
6. Wait for the Mini to connect.

The Mac may display a warning that this Wi-Fi network has no internet connection.

That is expected.

The camera's Wi-Fi exists to communicate with the camera, not to provide general internet access.

Do not interpret the lack of internet access on the camera network as a failed connection.

5.6 Verify Both Connections

Return to System Preferences → Network.

Confirm that:

• Wi-Fi is connected to the Vantrue F1.
• Ethernet is connected to the home network.
• Both interfaces have appropriate IP addresses.

For a more detailed inspection, open Terminal and run:

networksetup -listallhardwareports

This identifies the Mac's network interfaces and their device names.

You can also inspect the routing table:

netstat -rn

These commands are diagnostic. They do not change the network configuration.

5.7 Make Sure Home-Network Traffic Uses Ethernet

When two network interfaces are active, macOS determines which connection to use for traffic based on routing information and network service priority.

The camera's Wi-Fi provides the separate local connection to the F1. Ethernet provides the path to the home network and internet. Prefer Ethernet for the default route, while retaining the specific route to the camera's Wi-Fi network.

If necessary, on Catalina:

1. Open System Preferences → Network.
2. Click the gear-shaped action menu below the list of network services.
3. Choose Set Service Order.
4. Move Ethernet above Wi-Fi.
5. Click OK, then Apply.

Service order expresses a preference when macOS chooses between available network services; it does not disconnect Wi-Fi or route every connection through Ethernet. A more specific route to the camera's network still takes precedence over the default route.

Keep Wi-Fi connected to the F1. Moving Ethernet above Wi-Fi does not make the camera join the home network, nor does it bridge the two networks. If both networks use overlapping address ranges, service order alone may not resolve the conflict; review the addresses and routing table before changing settings.

5.8 Troubleshooting

5.9 Important Security Considerations

Because Catalina is no longer receiving routine security updates, avoid exposing the Mini directly to the internet.

Do not configure router port forwarding to the Mini unless there is a compelling reason and appropriate security controls.

Use strong passwords for the Mini's accounts and file sharing.

Remote access should be configured through an appropriately secured service rather than by exposing macOS sharing ports publicly.

5.10 What We Accomplished

At the end of this stage, the Mini could communicate with the Vantrue F1 over the camera's own Wi-Fi network while maintaining a separate connection to the home network through Ethernet.

This solved the central networking problem.

The camera did not need to join the home network.

The Mini could communicate with both.

And the user no longer needed to remain beside the motorcycle to operate the computer.