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``https://wiki.ubuntu.com/FanNetworking``.
If cloud-init sees a ``fan`` entry in cloud-config it will:
- write ``config_path`` with the contents of the ``config`` key
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- ensure the service is started (or restarted if was previously running)
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if not present.
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# fan 241
241.0.0.0/8 eth0/16 dhcp
config_path: /etc/network/fan
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