Adam Doupé

Associate Professor, Arizona State University
Director, Center for Cybersecurity and Trusted Foundations

Configuring Linux Bridge to Act as a Hub

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So after struggling for a while with this, the answer is surprisingly simple.

For a bridge that you've created with brctl, you can use this simple command:

brctl setageing <bridgename> 0

This command tells Linux to forget every MAC address that it sees on
the bridge, making it act as a hub.

Here's the source.