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doc: describe the IPv6 address generation (#3704)

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* doc: describe the IPv6 address generation

* fixes https://github.com/esphome/issues/issues/5618

* Update network.rst

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Co-authored-by: H. Árkosi Róbert <robreg@zsurob.hu>
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Götz Görisch 2024-03-21 20:24:15 +01:00 committed by GitHub
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components/network.rst
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@ -22,6 +22,12 @@ Configuration variables:
- **enable_ipv6** (*Optional*, boolean): Enables IPv6 support. Defaults to ``false``.
- **min_ipv6_addr_count** (*Optional*, integer): ESPHome considers the network to be connected when it has one IPv4 address and this number of IPv6 addresses. Defaults to ``0`` so as to not hang on boot with networks where IPv6 is not enabled. ``2`` is typically a reasonable value for configurations requiring IPv6.
.. note::
The `lwIP <https://savannah.nongnu.org/projects/lwip/>`_ library used for the network component currently only implements IPv6 SLAAC according to `RFC4862 <https://datatracker.ietf.org/doc/rfc4862/>`_. The interface identifier (IID) is directly generated from the device MAC address.
This has various security and privacy implications decribed in `RFC7721 <https://datatracker.ietf.org/doc/rfc7721/>`_, as this might leak outside of the smart home network and makes the device uniquely identifiable.
Therefore, the address generation does not comply to `RFC7217 <https://datatracker.ietf.org/doc/rfc7217/>`_.
See Also
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