Could you please more describe, what you want to achieve?
If you connect a USB to LAN adapter you can configure it via the web UI of the ctrlX OS. See "Settings -> Network Interfaces":
ctrlX CORE web UI - Network interface - USB LAN adapter
Bridges can be added to Network ports on the same UI page. See also topic "Bridge Port XF51 as 'Switch'":
ctrlX CORE web UI - add network bridge to USB LAN adapter
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