[dhcwg] Reminder - WGLC for draft-ietf-dhc-access-network-identifier-02 - respond by April 27, 2014

[Hidetoshi Yokota <[e-mail]>]

Dear all,

I reviewed the I-D and think it is in good shape for publication. Maybe one more cycle of revision would be beneficial. I add my comments below, most of which are for clarification.
 

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4.  DHCPv4 Access-Network-Identifier Option

   Access network identifier option carries information to identify the
   access network to which the client is attached to.  This information
   includes access technology type, network identifier and access
   network operator identifiers.

   The format of the DHCPv4 Access-Network-Identifier option is shown
   below.


   Code    Len          ANI Sub-options
  +------+------+------+------+------+--   --+-----+
  | code |  len |  s1  |  s2  |  s2  |  ...  |  sn |
  +------+------+------+------+------+--   --+-----+

   code: 8-bit code carrying Access Network Identifier sub-options,
         If added by relay agent: Relay Agent Information Option (82)
         If added by client: OPTION_ACCESS_NETWORK_ID (TBD1)

[HY] It should be resolved which option to be used (82 or TBD1) at this point.

   len: 8 bit indicating total length of the included suboptions.

[HY] The following sub-option format should go into Section 4.1

   ANI Sub-options: The  ANI Sub-options consists of a
     sequence of SubOpt/Length/Value tuples for each sub-option, encoded
     in the following manner:

   SubOpt   Len     Sub-option Value
   +------+------+------+------+------+------+--...-+------+
   | code |   N  |  s1  |  s2  |  s3  |  s4  |      |  sN  |
   +------+------+------+------+------+------+--...-+------+

  ANI Sub-options are defined in following sections.

4.1.  DHCPv4 Access-Network-Identifier Sub-options

   Access network identifier information will be defined in multiple
   sub-options.  The initial assignment of DHCP access network
   identifier Sub-options is as follows:








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           Sub-option Code            Sub-Option Description
          ---------------            ----------------------
               TBD7                   Access-Network-Type Sub-option
               TBD8                   Network-Name Sub-option
               TBD9                   AP-Name Sub-option
               TBD12                  AP-BSSID Sub-option
               TBD10                  Operator-Identifier Sub-option
               TBD11                  Operator-Realm Sub-option



5.  DHCPv6 Access-Network-Identifier options

   The Access Network Identifier option defined here will be added by
   DHCPv6 client in upstream DHCPv6 messages or by the Relay in Relay-
   forward messages.

           Option Code             Descrption
          ---------------   ----------------------
              TBD2           OPTION_ANI_ATT
              TBD3           OPTION_ANI_NETWORK_NAME
              TBD4           OPTION_ANI_AP_NAME
              TBD13          OPTION_ANI_AP_BSSID
              TBD5           OPTION_ANI_OPERATOR_ID
              TBD6           OPTION_ANI_OPERATOR_REALM



6.  DHCPv4 and DHCPv6 Access-Network-Identifier Options

   This section defines DHCPv4 suboption and DHCPv6 options for access
   network identification.

6.1.  Access-Network-Type option

[HY] Access-Network-Type (Sub-)option [Sub-option for DHCPv4, Option for DHCPv6]

   This option is used for exchanging the type of the access technology
   the client is attached to the network.  Its format is as follows:














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   DHCPv4:
   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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | suboption-code|   Length      |          ATT                  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    suboption-code:  8-bit code, it should be set to value of (TBD7),
                      indicating that its a Access-Network-Type sub-option

    Length: 8-bit unsigned integer indicating the length of this suboption
        in octets, excluding the suboption-code and length fields.
        This field MUST be set to 2.

[HY] According to RFC5213, the length of ATT is 1 octet. if 2 octets is preferred, 1 octet of reserved field should be prepended.

   DHCPv6:
    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 Code (TBD2)      |            OptLen             |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                       ATT                                     +
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   option-code:        16-bit code OPTION_ANI_ATT (TBD2)
   option-length:      16-bit unsigned integer indicating length
                       in octets of this option

[HY] It should be specified which value to be set in oOptLen and the same argument as the above.

   Common format applicable to DHCPv4 and DHCPv6:
   Access Technology Type (ATT)

        An 16-bit field that specifies the access technology through
        which the client is connected to the access link.

        The values is as populated from the IANA name space
        Access Technology Type Option type values as requested in [RFC5213]

        0: Reserved         ("Reserved")
        1: Virtual          ("Logical Network Interface")
        2: PPP              ("Point-to-Point Protocol")
        3: IEEE 802.3       ("Ethernet")
        4: IEEE 802.11a/b/g ("Wireless LAN")
        5: IEEE 802.16e     ("WIMAX")

[HY] IANA assigns more than these values (0-12). Refer to the following link:
  http://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml#mobility-parameters-10" rel="nofollow">http://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml#mobility-parameters-10







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6.2.  Network-Identifier options

[HY] Network-Identifier (Sub-)options 
 Note: "(Sub-)options for Network identifier" may be better for a general name.

   These options can be used for carrying the name of the access network
   (e.g., a SSID in case of IEEE 802.11 Access Network, or PLMN
   Identifier [TS23003] in case of 3GPP access ) and Access Point name,
   to which the client is attached.  The format of these options is
   defined below.



   DHCPv4:

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |suboption code |   Length      |                               ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                     Network Name (e.g., SSID or PLMNID)       ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   suboption code:  8-bit code, it should be set to value of (TBD8),
                    indicating that its a Network-Name sub-option

   Length:  8-bit indicating Total length of this sub option,
           excluding the suboption code and length fields.
           The value can be in the range of 2 to 32 octets.


[HY] "Total length" is misleading since this does not include the subopt code and length fields. I recommend "the length" instead.

   DHCPv6:
    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 Code (TBD3)      |            OptLen             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                     Network Name (e.g., SSID or PLMNID)       ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   option-code:        16-bit code OPTION_ANI_NETWORK_NAME (TBD3)
   option-length:      16-bit unsigned integer indicating length
                       in octets of this option.The value can be in the
                       range of 2 to 32 octets.

   Common format applicable to DHCPv4 and DHCPv6:


   Network Name:  The name of the access network to which the mobile



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      node is attached.  The type of the Network Name is dependent on
      the access technology to which the mobile node is attached.  If it
      is 802.11 access, the Network Name MUST be the SSID of the
      network.  If the access network is 3GPP access, the Network Name
      is the PLMN Identifier of the network.  If the access network is
      3GPP2 access, the Network Name is the
      Access Network Identifier [ANI].

      When encoding the PLMN Identifier, both the Mobile Network Code
      (MNC) [TS23003] and Mobile Country Code (MCC) [TS23003] MUST be 3
      digits.  If the MNC in use only has 2 digits, then it MUST be
      preceded with a '0'.  Encoding MUST be UTF-8.







































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   DHCPv4:

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |suboption code |   Length      |                               ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                        Access-Point Name                      ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   suboption code: 8-bit code, it should be set to value of (TBD9),
                   indicating that its a Network-AP-Name sub-option

[HY] "Network-AP-Name sub-option" -> "AP-Name Sub-option".

   Length:  8-bit indicating Total length of this sub option,
           excluding the suboption code and length fields.
           The value can be in the range of 2 to 32 octets.

[HY] Same argument for "Total length".

   DHCPv6:

    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 Code (TBD3)      |          OptLen               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                        Access-Point Name                      ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   option-code:        16-bit code OPTION_ANI_AP_NAME (TBD4)
   option-length:      16-bit unsigned integer indicating length
                       in octets of this option.The value can be in the
                       range of 2 to 32 octets.

   Common format applicable to DHCPv4 and DHCPv6:

   Access-Point Name:   The name of the access point (physical device
      name) to which the mobile node is attached.  This is the
      identifier that uniquely identifies the access point.  While
      Network Name (e.g., SSID) identifies the operator's access
      network, Access-Point Name identifies a specific network device in
      the network to which the mobile node is attached.  In some
      deployments, the Access-Point Name can be set to the Media Access
      Control (MAC) address of the device or some unique identifier that
      can be used by the policy systems in the operator network to
      unambiguously identify the device.  The string is carried in UTF-8
      representation.


[HY] 3GPP also defines "Access Point Name (APN)" as a reference to GGSN/PGW according to [TS23003]. This should be disambiguated. 




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   DHCPv4:

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |suboption code |   Length(6)      |                            ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   ~                        Access-Point BSSID                     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   suboption code: 8-bit code, it should be set to value of (TBD12),
                   indicating that its a AP-BSSID sub-option

   Length:  8-bit indicating Total length of this sub option,
           excluding the suboption code and length fields.
           The value is set to 6.

[HY] Same argument for "Total length".

   DHCPv6:

    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 Code (TBD3)      |          OptLen(6)            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                        Access-Point BSSID                     ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   ~                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   option-code:        16-bit code OPTION_ANI_AP_BSSID (TBD13)
   option-length:      16-bit unsigned integer indicating length
                       in octets of this option.The value is set to 6.

   Common format applicable to DHCPv4 and DHCPv6:

   Access-Point BSSID:   The 48-bit Basic service set identification(BSSID)
      of the access point to which the mobile node is attached.

6.3.  Operator identifier options

[HY] "Operator-Identifier (Sub-)option 

   The Operator identifier options can be used for carrying the operator
   identifier of the access network to which the client is attached.

[HY] The Vendor-specific suboption for Relay agent option [RFC4243] can carry the same type of information. Any thought on that? 

   The format of these options is defined below.









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 DHCPv4:

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | suboptioncode |     Length    |                               ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   ~      Operator Enterprise ID   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   suboption code:  8 bit code, It should be set to value of (TBD10),
                  indicating that it is Operator-Identifier sub-option

   Length:  Total length of this sub option, excluding the suboption code
      and length fields.

[HY] 8 bit of length? Also, the same argument for "Total length". The value can be  fixed to "32".

 DHCPv6:
    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 Code (TBD4)      |            OptLen             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                Operator Enterprise ID                         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   option-code:        16-bit code OPTION_ANI_OPERATOR_ID (TBD5)
   option-length:      16-bit unsigned integer indicating length
                       in octets of this option.

[HY] The Vendor-specific suboption for Relay agent option [RFC4243] can carry the same type of information. Any thought on that? 

   The format of these options is defined below.









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 DHCPv4:

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | suboptioncode |     Length    |                               ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   ~      Operator Enterprise ID   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   suboption code:  8 bit code, It should be set to value of (TBD10),
                  indicating that it is Operator-Identifier sub-option

   Length:  Total length of this sub option, excluding the suboption code
      and length fields.

[HY] The value can be  fixed to "32".

 Common format applicable to DHCPv4 and DHCPv6:

   Operator Enterprise ID: Vendor ID as a four octet
                           Private Enterprise Number [SMI].
















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  DHCPv4:

     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
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | suboptioncode |     Length    |                               ~
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    ~                        Operator Realm                         ~
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    suboption code:  8 bit code, It should be set to value of (TBD11),
                   indicating that it is Operator-Realm sub-option

    Length:  Total length of this sub option, excluding the suboption
       code and length fields.
[HY] The Vendor-specific suboption for Relay agent option [RFC4243] can carry the same type of information. Any thought on that? 

   The format of these options is defined below.









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 DHCPv4:

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | suboptioncode |     Length    |                               ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   ~      Operator Enterprise ID   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   suboption code:  8 bit code, It should be set to value of (TBD10),
                  indicating that it is Operator-Identifier sub-option

   Length:  Total length of this sub option, excluding the suboption code
      and length fields.

[HY] 8 bit of length? Also, the same argument for "Total length".

  DHCPv6:
     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 Code (TBD4)      |              OptLen           |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    ~                       Operator Realm                          ~
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


    option-code:        16-bit code OPTION_ANI_OPERATOR_REALM (TBD6)
    option-length:      16-bit unsigned integer indicating length
                        in octets of this option.

  Common format applicable to DHCPv4 and DHCPv6:

  Operator Realm:  Realm of the operator. Realm names are required to be
          unique, and are piggybacked on the administration of the DNS
          namespace.  Realms are encoded using a domain name encoding
          defined in [RFC1035].Up to 253 octets of the operator realm.

[HY] According to RFC1035, the maximum length of a domain name is 255. if it has more than 253, is it truncated? If so, how?


13.  Change log

   Changes from 00 - 01

[HY] Changes from 01 - 02 ?

   o  Added AP BSSID information

   Changes from 00 - 01

   o  Edited security consideration to handle multiple relay agents
      adding access network identifier options, server and relay agent
      behavior.

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-- 
Hidetoshi Yokota

KDDI R&D Laboratories, Inc.
e-mail:[e-mail]