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man: network: document Use6RD= setting
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@ -861,11 +861,12 @@ Table=1234</programlisting></para>
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</varlistentry>
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<varlistentry>
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<term><varname>DHCPPrefixDelegation=</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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[DHCPPrefixDelegation] section. Defaults to disabled.</para></listitem>
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<listitem><para>Takes a boolean value. When enabled, requests subnet prefixes acquired by a
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DHCPv6 client, or by a DHCPv4 client through the 6RD option configured on another link. By
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default, an address within each delegated prefix will be assigned, and the prefixes will be
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announced through IPv6 Router Advertisement when <varname>IPv6SendRA=</varname> is enabled.
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Such default settings can be configured in [DHCPPrefixDelegation] section. Defaults to
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disabled.</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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@ -1900,6 +1901,15 @@ Table=1234</programlisting></para>
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the local system. Defaults to false.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Use6RD=</varname></term>
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<listitem><para>When true, subnets of the received IPv6 prefix are assigned to downstream
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interfaces which enables <varname>DHCPPrefixDelegation=</varname>. See also
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<varname>DHCPPrefixDelegation=</varname> in the [Network] section, the [DHCPPrefixDelegation]
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section, and <ulink url="https://tools.ietf.org/html/rfc5969">RFC 5969</ulink>. Defaults to
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false.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>FallbackLeaseLifetimeSec=</varname></term>
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<listitem>
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@ -2114,9 +2124,10 @@ Table=1234</programlisting></para>
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<refsect1>
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<title>[DHCPPrefixDelegation] Section Options</title>
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<para>The [DHCPPrefixDelegation] section configures delegated prefixes assigned by DHCPv6 server.
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The settings in this section are used only when <varname>DHCPPrefixDelegation=</varname> setting
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is enabled.</para>
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<para>The [DHCPPrefixDelegation] section configures subnet prefixes of the delegated prefixes
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acquired by a DHCPv6 client, or by a DHCPv4 client through the 6RD option on another interface.
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The settings in this section are used only when the <varname>DHCPPrefixDelegation=</varname>
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setting in the [Network] section is enabled.</para>
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<variablelist class='network-directives'>
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<varlistentry>
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@ -2127,7 +2138,7 @@ Table=1234</programlisting></para>
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interface itself is considered the uplink interface, and
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<varname>WithoutRA=solicit</varname> is implied if the setting is not explicitly specified.
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When <literal>:auto</literal>, the first link which acquired prefixes to be delegated from
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the DHCPv6 server is selected. Defaults to <literal>:auto</literal>.</para>
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the DHCPv6 or DHCPv4 server is selected. Defaults to <literal>:auto</literal>.</para>
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</listitem>
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</varlistentry>
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@ -2147,7 +2158,8 @@ Table=1234</programlisting></para>
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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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This setting will be ignored when the <varname>DHCPPrefixDelegation=</varname> setting is
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enabled on the upstream interface. Defaults to yes.</para>
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</listitem>
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</varlistentry>
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