X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=man%2Fsysctl.d.xml;h=db53b495998b27671662d0c31619305a6fd93670;hp=ce5c34f9a209b2c3fee013d3a067dce2b4100cfc;hb=2e573fcf8754fdfe0db0a783b1631ec1679b063a;hpb=0b429ab7fca2aa139ffbeeac8bdcfbbd21cc1a60

diff --git a/man/sysctl.d.xml b/man/sysctl.d.xml
index ce5c34f9a..db53b4959 100644
--- a/man/sysctl.d.xml
+++ b/man/sysctl.d.xml
@@ -68,13 +68,26 @@
                 <para>The configuration files contain a list of
                 variable assignments, separated by newlines. Empty
                 lines and lines whose first non-whitespace character
-                is # or ; are ignored.</para>
-
-                <para>Note that both / and . are accepted as label
-                separators within sysctl variable
-                names. <literal>kernel.domainname=foo</literal> and
-                <literal>kernel/domainname=foo</literal> hence are
-                entirely equivalent.</para>
+                is <literal>#</literal> or <literal>;</literal> are
+                ignored.</para>
+
+                <para>Note that either <literal>/</literal> or
+                <literal>.</literal> may be used as separators within
+                sysctl variable names. If the first separator is a
+                slash, remaining slashes and dots are left intact. If
+                the first separator is a dot, dots and slashes are
+                interchanged. <literal>kernel.domainname=foo</literal>
+                and <literal>kernel/domainname=foo</literal> are
+                equivalent and will cause <literal>foo</literal> to
+                be written to
+                <filename>/proc/sys/kernel/domainname</filename>.
+                Either
+                <literal>net.ipv4.conf.enp3s0/200.forwarding</literal>
+                or
+                <literal>net/ipv4/conf/enp3s0.200/forwarding</literal>
+                may be used to refer to
+                <filename>/proc/sys/net/ipv4/conf/enp3s0.200/forwarding</filename>.
+                </para>
 
                 <para>Each configuration file shall be named in the
                 style of <filename><replaceable>program</replaceable>.conf</filename>.
@@ -89,11 +102,13 @@
                 administrator, who may use this logic to override the
                 configuration files installed by vendor packages. All
                 configuration files are sorted by their filename in
-                alphabetical order, regardless in which of the
-                directories they reside, to guarantee that a specific
-                configuration file takes precedence over another file
-                with an alphabetically earlier name, if both files
-                contain the same variable setting.</para>
+                lexicographic order, regardless of which of the
+                directories they reside in. If multiple files specify the
+                same variable name, the entry in the file with the
+                lexicographically latest name will be applied. It is
+                recommended to prefix all filenames with a two-digit
+                number and a dash, to simplify the ordering of the
+                files.</para>
 
                 <para>If the administrator wants to disable a
                 configuration file supplied by the vendor, the
@@ -101,6 +116,16 @@
                 <filename>/dev/null</filename> in
                 <filename>/etc/sysctl.d/</filename> bearing the
                 same filename.</para>
+
+                <para>The settings configured with
+                <filename>sysctl.d</filename> files will be applied
+                early on boot. The network interface-specific options
+                will also be applied individually for each network
+                interface as it shows up in the system. (More
+                specifically,
+                <filename>net.ipv4.conf.*</filename>,
+                <filename>net.ipv6.conf.*</filename>,
+                <filename>net.ipv4.neigh.*</filename> and <filename>net.ipv6.neigh.*</filename>)</para>
         </refsect1>
 
         <refsect1>