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nixos/release-notes: mention that dhcpcd stopped giving IPv4 addresses to bridges by default

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This is an backward incompatible change from upstream dhcpcd [0], as
this could have easily locked me out of my box.

As dhcpcd doesn't allow to use only a blacklist (denyinterfaces in
dhcpcd.conf) of devices and use all remaining devices, while explicitly
allowing some interfaces like bridges, I think the best option would be
to not change anything about it and just educate the users here about
that edge case and how to solve it.

[0] https://roy.marples.name/archives/dhcpcd-discuss/0002621.html
This commit is contained in:
Justin Humm 2020-03-11 00:32:44 +01:00
parent e89b1063fb
commit eeeb2bf803
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nixos/doc/manual/release-notes/rl-2003.xml
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@ -377,6 +377,17 @@ services.xserver.displayManager.defaultSession = "xfce+icewm";
</para>
<itemizedlist>
<listitem>
<para>
The <package>dhcpcd</package> package <link xlink:href="https://roy.marples.name/archives/dhcpcd-discuss/0002621.html">
does not request IPv4 addresses for tap and bridge interfaces anymore by default</link>.
In order to still get an address on a bridge interface, one has to disable
<literal>networking.useDHCP</literal> and explicitly enable
<literal>networking.interfaces.&lt;name&gt;.useDHCP</literal> on
every interface, that should get an address via DHCP. This way, dhcpcd
is configured in an explicit way about which interface to run on.
</para>
</listitem>
<listitem>
<para>
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