看起来它带有 DUID。

来自 - RFC 5007 第 4.3.3 节

4.3.3.  Receipt of LEASEQUERY-REPLY

   A successful LEASEQUERY-REPLY is one without an OPTION_STATUS_CODE
   option (or an OPTION_STATUS_CODE option with a success code).  There
   are three variants:

   1.  If the server had bindings for the requested client, the message
       includes an OPTION_CLIENT_DATA option and the requestor extracts
       the client data from the LEASEQUERY-REPLY and updates its binding
       information database.  If the OPTION_CLIENT_DATA contains no
       OPTION_CLT_TIME, the requestor SHOULD silently discard the
       OPTION_CLIENT_DATA option.

如果我们查看RFC 5007 第 4.4.2 节中如何构造“OPTION_CLIENT_DATA”的详细信息

4.4.2.  Constructing the Client's OPTION_CLIENT_DATA

   An OPTION_CLIENT_DATA option in a LEASEQUERY-REPLY message MUST
   minimally contain the following options:
   1.  OPTION_CLIENTID
   2.  OPTION_IAADDR and/or OPTION_IAPREFIX
   3.  OPTION_CLT_TIME

现在我们可以查看RFC 3315 第 22.2 节中“OPTION_CLIENTID”的详细信息

22.2. Client Identifier Option

   The Client Identifier option is used to carry a DUID (see section 9)
   identifying a client between a client and a server.  The format of
   the Client Identifier option is:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |        OPTION_CLIENTID        |          option-len           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      .                                                               .
      .                              DUID                             .
      .                        (variable length)                      .
      .                                                               .
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      option-code   OPTION_CLIENTID (1).

      option-len    Length of DUID in octets.