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man: add a note about Name=eth0 being bad

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Fixes #2657.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2017-09-14 12:13:31 +02:00
parent 07970eecbf
commit 1b934761ae
1 changed files with 11 additions and 1 deletions
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12
man/systemd.link.xml
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@ -79,7 +79,7 @@
how the device should be configured. The first (in lexical order)
of the link files that matches a given device is applied. Note
that a default file <filename>99-default.link</filename> is
shipped by the system, any user-supplied
shipped by the system. Any user-supplied
<filename>.link</filename> should hence have a lexically earlier
name to be considered at all.</para>
@ -332,6 +332,16 @@
<varname>NamePolicy=</varname> fail, or in case
<varname>NamePolicy=</varname> is missing or
disabled.</para>
<para>Note that specifying a name that the kernel might use for another
interface (for example <literal>eth0</literal>) is dangerous because the
name assignment done by udev will race with the assignment done by the
kernel, and only one interface may use the name. Depending on the order of
operations, either udev or the kernel will win, making the naming
unpredictable. It is best to use some different prefix, for example
<literal>internal0</literal>/<literal>external0</literal> or
<literal>lan0</literal>/<literal>lan1</literal>/<literal>lan3</literal>.
</para>
</listitem>
</varlistentry>
<varlistentry>