man: Document prefix delegation in systemd.network
Add prefix delegation documentation covering IPv6PrefixDelegation= setting in the Network section as well as all the parameters and the IPv6PrefixDelegation and IPv6Prefix sections implemented so far, including DNS= and DNSLifetimeSec= settings.
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Patrik Flykt
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@ -636,6 +636,13 @@
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<option>IPv6ProxyNDP</option> has been set to false. Defaults to unset.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>IPv6PrefixDelegation=</varname></term>
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<listitem><para>Whether to enable or disable Router Advertisement sending on a link.
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Defaults to <literal>false</literal>. See the <literal>[IPv6PrefixDelegation]</literal>
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and the <literal>[IPv6Prefix]</literal> sections for configuration options.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Bridge=</varname></term>
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<listitem>
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@ -1312,6 +1319,116 @@
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</refsect1>
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<refsect1>
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<title>[IPv6PrefixDelegation] Section Options</title>
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<para>The <literal>[IPv6PrefixDelegation]</literal> section contains
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settings for sending IPv6 Router Advertisements and whether to act as
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a router, if enabled via the <varname>IPv6PrefixDelegation=</varname>
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option described above. IPv6 network prefixes are defined with one or
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more <literal>[IPv6Prefix]</literal> sections.</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>Managed=</varname></term>
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<term><varname>OtherInformation=</varname></term>
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<listitem><para>Controls whether a DHCPv6 server is used to acquire IPv6
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addresses on the network link when <varname>Managed=</varname> boolean
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is set to <literal>true</literal> or if only additional network
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information can be obtained via DHCPv6 for the network link when
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<varname>OtherInformation=</varname> boolean is set to
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<literal>true</literal>. Both settings default to
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<literal>false</literal>, which means that a DHCPv6 server is not being
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used.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>RouterLifetimeSec=</varname></term>
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<listitem><para>Configures the IPv6 router lifetime in seconds. If set,
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this host also announces itself in Router Advertisements as an IPv6
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router for the network link. Defaults to unset, which means the host is
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not acting as a router.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>RouterPreference=</varname></term>
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<listitem><para>Configures IPv6 router preference if
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<varname>RouterLifetimeSec=</varname> is non-zero. Valid values are
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<literal>high</literal>, <literal>medium</literal> and
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<literal>low</literal>, with <literal>normal</literal> and
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<literal>default</literal> added as synonyms for
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<literal>medium</literal> just to make configuration easier. See
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<ulink url="https://tools.ietf.org/html/rfc4191">RFC 4191</ulink>
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for details. Defaults to <literal>medium</literal>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DNS=</varname></term>
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<listitem><para>A list of recursive DNS server IPv6 addresses
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distributed via Router Advertisement messages.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DNSLifetimeSec=</varname></term>
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<listitem><para>Lifetime in seconds for the DNS server addresses listed
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in <varname>DNS=</varname>.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>[IPv6Prefix] Section Options</title>
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<para>One or more <literal>[IPv6Prefix]</literal> sections contain the IPv6
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prefixes that are announced via Router Advertisements. See
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<ulink url="https://tools.ietf.org/html/rfc4861">RFC 4861</ulink>
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for further details.</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>AddressAutoconfiguration=</varname></term>
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<term><varname>OnLink=</varname></term>
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<listitem><para>Boolean values to specify whether IPv6 addresses can be
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autoconfigured with this prefix and whether the prefix can be used for
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onlink determination. Both settings default to <literal>true</literal>
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in order to ease configuration.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Prefix=</varname></term>
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<listitem><para>The IPv6 prefix that is to be distributed to hosts.
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Similarly to configuring static IPv6 addresses, the setting is
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configured as an IPv6 prefix and its prefix length, separated by a
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<literal>/</literal> character. Use multiple
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<literal>[IPv6Prefix]</literal> sections to configure multiple IPv6
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prefixes since prefix lifetimes, address autoconfiguration and onlink
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status may differ from one prefix to another.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>PreferredLifetimeSec=</varname></term>
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<term><varname>ValidLifetimeSec=</varname></term>
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<listitem><para>Preferred and valid lifetimes for the prefix measured in
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seconds. <varname>PreferredLifetimeSec=</varname> defaults to 604800
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seconds (one week) and <varname>ValidLifetimeSec=</varname> defaults
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to 2592000 seconds (30 days).</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>[Bridge] Section Options</title>
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<para>The <literal>[Bridge]</literal> section accepts the
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following keys.</para>
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