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3.2.5.4 Receiving a DHCPINFORM Message

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If the DHCPINFORM message does not contain Rogue Detection Request Option (section 2.2.2.4), evaluate and apply administrative controls as described in section 1.4, point 6.<40>

When a DHCPv4 server implementing this specification receives a DHCPINFORM message containing an OPTION_PARAMETER_REQUEST_LIST (Option 55) ([RFC2132] section 9.8) with OPTION_USER_CLASS (Option 77) ([RFC3004] section 4) as one of the requested options, the DHCPv4 server SHOULD<41> send a DHCPACK message to the DHCPv4 client containing one or more User Class Options (one for each user class configured on the DHCPv4 Server) in the format specified in section 2.2.6. If the option request is received in a message other than DHCPINFORM message, the request is silently ignored.

If the DHCPINFORM message contains the Rogue Detection Request option (section 2.2.2.4):

  • An Administratively Authorized Server<42> that is Rogue Aware SHOULD<43> reply to the DHCPINFORM message by sending a DHCPACK message containing the Rogue Detection Reply Option (section 2.2.2.5) with a non-empty NULL-terminated string in the option data.

A Rogue Authorized Server on the network SHOULD<44> reply to the DHCPINFORM message by sending a DHCPACK message containing the Rogue Detection Reply Option (section 2.2.2.5) with an empty NULL-terminated string in the option data.