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man: update documents about IPv6 RA and DHCPv6-PD
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Yu Watanabe
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@ -810,17 +810,23 @@ IPv6Token=prefixstable:2002:da8:1::</programlisting></para>
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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. Allowed
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values are <literal>static</literal> which distributes prefixes as defined in the
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[IPv6PrefixDelegation] and any [IPv6Prefix] sections, <literal>dhcpv6</literal> which requests
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prefixes using a DHCPv6 client configured for another link and any values configured in the
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[IPv6PrefixDelegation] section while ignoring all static prefix configuration sections,
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<literal>yes</literal> which uses both static configuration and DHCPv6, and
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<literal>false</literal> which turns off IPv6 prefix delegation altogether. Defaults to
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<literal>false</literal>. See the [IPv6PrefixDelegation] and the [IPv6Prefix] sections for more
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<term><varname>IPv6SendRA=</varname></term>
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<listitem><para>Whether to enable or disable Router Advertisement sending on a link. Takes a
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boolean value. When enabled, prefixes configured in [IPv6Prefix] sections and routes
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configured in [IPv6RoutePrefix] sections are distributed as defined in the [IPv6SendRA]
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section. If <varname>DHCPv6PrefixDelegation=</varname> is enabled, then the delegated
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prefixes are also distributed. See <varname>DHCPv6PrefixDelegation=</varname> setting and the
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[IPv6SendRA], [IPv6Prefix], [IPv6RoutePrefix], and [DHCPv6PrefixDelegation] sections for more
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configuration options.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DHCPv6PrefixDelegation=</varname></term>
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<listitem><para>Takes a boolean value. When enabled, requests prefixes using a DHCPv6 client
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configured on another link. By default, an address within each delegated prefix will be
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assigned, and the prefixes will be announced through IPv6 Router Advertisement when
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<varname>IPv6SendRA=</varname> is enabled. Such default settings can be configured in
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[DHCPv6PrefixDelegation] section.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>IPv6MTUBytes=</varname></term>
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<listitem><para>Configures IPv6 maximum transmission unit (MTU).
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@ -1957,9 +1963,9 @@ IPv6Token=prefixstable:2002:da8:1::</programlisting></para>
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<refsect1>
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<title>[DHCPv6PrefixDelegation] Section Options</title>
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<para>The [DHCPv6PrefixDelegation] section configures delegated prefix assigned by DHCPv6 server.
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The settings in this section are used only when <varname>IPv6PrefixDelegation=</varname> setting is
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enabled, or set to <literal>dhcpv6</literal>.</para>
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<para>The [DHCPv6PrefixDelegation] section configures delegated prefixes assigned by DHCPv6 server.
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The settings in this section are used only when <varname>DHCPv6PrefixDelegation=</varname> setting
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is enabled.</para>
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<variablelist class='network-directives'>
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<varlistentry>
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@ -1969,9 +1975,16 @@ IPv6Token=prefixstable:2002:da8:1::</programlisting></para>
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delegation. You can either set "auto" (the default) or a specific subnet ID (as defined in
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<ulink url="https://tools.ietf.org/html/rfc4291#section-2.5.4">RFC 4291</ulink>, section
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2.5.4), in which case the allowed value is hexadecimal, from 0 to 0x7fffffffffffffff
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inclusive. This option is only effective when used together with
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<varname>IPv6PrefixDelegation=</varname> and the corresponding configuration on the upstream
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interface.</para>
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inclusive.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Announce=</varname></term>
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<listitem>
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<para>Takes a boolean. When enabled, and <varname>IPv6SendRA=</varname> in [Network] section
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is enabled, the delegated prefixes are distributed through the IPv6 Router Advertisement.
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Defaults to yes.</para>
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</listitem>
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</varlistentry>
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@ -1979,19 +1992,22 @@ IPv6Token=prefixstable:2002:da8:1::</programlisting></para>
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<term><varname>Assign=</varname></term>
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<listitem>
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<para>Takes a boolean. Specifies whether to add an address from the delegated prefixes which
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are received from the WAN interface by the <varname>IPv6PrefixDelegation=</varname>. When
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true (on LAN interfce), the EUI-64 algorithm will be used to form an interface identifier
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from the delegated prefixes. Defaults to true.</para>
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are received from the WAN interface by the DHCPv6 Prefix Delegation. When true (on LAN
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interfce), the EUI-64 algorithm will be used by default to form an interface identifier from
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the delegated prefixes. See also <varname>Token=</varname> setting below. Defaults to yes.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Token=</varname></term>
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<listitem>
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<para>Specifies an optional address generation mode for <varname>Assign=</varname>. Takes an
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IPv6 address. When set, the lower bits of the supplied address are combined with the upper
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bits of a delegatad prefix received from the WAN interface by the
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<varname>IPv6PrefixDelegation=</varname> prefixes to form a complete address.</para>
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<para>Specifies an optional address generation mode for assigning an address in each
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delegated prefix. Takes an IPv6 address. When set, the lower bits of the supplied address is
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combined with the upper bits of each delegatad prefix received from the WAN interface by the
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DHCPv6 Prefix Delegation to form a complete address. When <varname>Assign=</varname> is
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disabled, this setting is ignored. When unset, the EUI-64 algorithm will be used to form
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addresses. Defaults to unset.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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@ -2213,10 +2229,11 @@ IPv6Token=prefixstable:2002:da8:1::</programlisting></para>
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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 [IPv6PrefixDelegation] section contains settings for sending IPv6 Router Advertisements and
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whether to act as a router, if enabled via the <varname>IPv6PrefixDelegation=</varname> option described
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above. IPv6 network prefixes are defined with one or more [IPv6Prefix] sections.</para>
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<title>[IPv6SendRA] Section Options</title>
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<para>The [IPv6SendRA] section contains settings for sending IPv6 Router Advertisements and whether
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to act as a router, if enabled via the <varname>IPv6SendRA=</varname> option described above. IPv6
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network prefixes or routes are defined with one or more [IPv6Prefix] or [IPv6RoutePrefix] sections.
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</para>
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<variablelist class='network-directives'>
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@ -3586,10 +3603,13 @@ DHCP=ipv6</programlisting>
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Name=enp2s0
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[Network]
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IPv6PrefixDelegation=dhcpv6</programlisting>
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IPv6SendRA=yes
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DHCPv6PrefixDelegation=yes</programlisting>
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<para>This will enable IPv6 PD on the interface enp1s0 as an upstream interface where the
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DHCPv6 client is running and enp2s0 as a downstream interface where the prefix is delegated to.</para>
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<para>This will enable DHCPv6-PD on the interface enp1s0 as an upstream interface where the
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DHCPv6 client is running and enp2s0 as a downstream interface where the prefix is delegated to.
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The delegated prefixes are distributed by IPv6 Router Advertisement on the downstream network.
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</para>
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</example>
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<example>
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