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@@ -1058,6 +1058,67 @@ temporarily override a list of interface names and listen on all interfaces.
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</para>
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</section>
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+ <section id="dhcp4-stateless-configuration">
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+ <title>Stateless Configuration of DHCPv4 clients</title>
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+ <para>The DHCPv4 server supports the stateless client configuration whereby the
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+ client has an IP address configured (e.g. using manual configuration) and only
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+ contacts the server to obtain other configuration parameters, e.g. DNS servers' addresses.
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+ In order to obtain the stateless configuration parameters the client sends the
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+ DHCPINFORM message to the server with the "ciaddr" set to the address that the
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+ client is currently using. The server unicasts the DHCPACK message to the
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+ client that includes the stateless configuration ("yiaddr" not set).
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+ </para>
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+
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+ <para>The server will respond to the DHCPINFORM when the client is associated
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+ with the particular subnet defined in the server's configuration. The example
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+ subnet configuration will look like this:
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+ <screen>
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+"Dhcp4": {
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+ "subnet4": [
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+ {
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+ "subnet": "192.0.2.0/24"
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+ "option-data": [ {"
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+ "name": "routers",
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+ "code": 3,
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+ "data": "192.0.2.200,192.0.2.201",
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+ "csv-format": true,
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+ "space": "dhcp4"
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+ } ]
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+ }
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+ ]
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+}</screen>
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+ </para>
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+ <para>This subnet specifies the single option which will be included in
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+ the DHCPACK message to the client in response to DHCPINFORM. Note that
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+ the subnet definition does not require the address pool configuration
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+ if it will be used solely for the stateless configuration.
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+ </para>
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+
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+ <para>This server will associate the subnet with the client if one of
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+ the following conditions is met:
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+ <itemizedlist>
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+ <listitem>
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+ <simpara>The DHCPINFORM is relayed and the giaddr matches the
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+ configured subnet.</simpara>
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+ </listitem>
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+ <listitem>
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+ <simpara>The DHCPINFORM is unicast from the client and the ciaddr
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+ matches the configured subnet.</simpara>
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+ </listitem>
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+ <listitem>
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+ <simpara>The DHCPINFORM is unicast from the client, the ciaddr is
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+ not set but the source address of the IP packet matches the
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+ configured subnet.</simpara>
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+ </listitem>
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+ <listitem>
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+ <simpara>The DHCPINFORM is not relayed and the IP address on the
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+ interface on which the message is received matches the configured
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+ subnet.</simpara>
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+ </listitem>
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+ </itemizedlist>
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+ </para>
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+ </section>
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+
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<section id="dhcp4-client-classifier">
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<title>Client Classification in DHCPv4</title>
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<note>
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Marcin Siodelski