draft-park-ipv6-extensions-dns-pnp-00.txt

bind 9.3结合mysql数据库

Park & Madanapalli             Expires October 2003            [Page 16]

INTERNET-DRAFT     IPv6 Extensions for DNS Plug and Play      April 2003



   +---------+      +---------+      +---------+      +---------+
   | 6DNAC-A |      | 6DNAC-S |      | 6DNAC-B |      |  DNS-S  |
   +----+----+      +----+----+      +----+----+      +----+----+
        |                |                |                |
        |     RA with    |     RA with    |                |
        | DNS Suffix Opt | DNS Suffix Opt |                |
        |<---------------|--------------->|                |
        |       #1       |       #1       |                |
        |---+            |                |---+            |
  Construct | #2         |          Construct | #2         |
      FQDN  |            |              FQDN  |            |
        |<--+            |                |<--+            |
 DAD/DFQDND Starts       |         DAD/DFQDND Starts       |
        |                |            <DELAYED>            |
        |                |                |                |
        |    NS with     |                |                |
        |    FQDN Opt    |                |                |
        |--------------->|                |                |
        |      #3        |                |                |
        |            No Entry             |                |
        |                |------+         |                |
        |          Create FQDN  | #4      |                |
        |            <FQDN,A>   |         |                |
        |                |<-----+         |                |
        |                |                |                |
        |                |         Register FQDN #5        |
        |                |-------------------------------->|
        |                |                |                |
        |                |    NS with     |                |
        |                |    FQDN Opt    |                |
        |                |<---------------|                |
        |                |       #6       |                |
        |                |------+         |                |
        |         FQDN is in use|         |                |
        |          Defend DFQDND| #7      |                |
        |                |<-----+         |                |
        |                |                |                |
        |                |    NA with     |                |
        |                |    D-flag Set  |                |
        |                |--------------->|                |
        |                |       #8       |                |
        |------+         |                |---+            |
 No Response   | #9      |            Enter   | #10        |
 DFQDND Success|         |          Retry Mode|            |
        |<-----+         |                |<--+            |
        |                |                |                |
        v                v                v                v

         
       <Figure: 10 Multiple Hosts Requesting Same Domain Name>





Park & Madanapalli             Expires October 2003            [Page 17]

INTERNET-DRAFT     IPv6 Extensions for DNS Plug and Play      April 2003          

  #1. 6DNAC Server (Router) sends out router advertisement with DNS
      Suffix information.
      
  #2. 6DNAC Clients A&B process the router advertisement and construct
      their FQDN by prefixing hostname to the DNS Zone Suffix.  They
      also construct IPv6 address from the autoconfiguration prefix
      information option.
      
      When each host is trying to go for DAD, all hosts must have
      random delay to avoid the traffic congestion according to [2461].
      So here it is assumed that 6DNAC Client-A starts DAD first and
      6DNAC Client-B starts DAD later.

  #3. 6DNAC Client-A starts duplicate address & FQDN detection for the
      IPv6 address & FQDN constructed and sends out a Neighbor
      Solicitation message with FQDN option.
   
  #4. 6DNAC Server processes the Neighbor Solicitation message sent by
      6DNAC Client-A as part of duplicate FQDN detection procedure and
      creates a FQDN entry in its FQDN Cache (assuming that there is no
      entry <FQDN,A>), where A is Link Layer Address of the 6DNAC Client-A.

  #5. 6DNAC Server then registers FQDN and corresponding IPv6 address
      through the existing protocol DDNS UPDATE.

  #6. 6DNAC Client-B starts duplicate address & FQDN detection for the
      IPv6 address & FQDN constructed and sends out a Neighbor Solicitation
      message with FQDN option. 

  #7. 6DNAC Server processes the Neighbor Solicitation message sent by
      6DNAC Client-B as part of duplicate FQDN detection procedure and 
      finds that the domain name is already in use by the 6DNAC Client-A.
      Hence, concludes to defend the duplicate FQDN detection of 6DNAC
      Client-B.

  #8. 6DNAC Server sends out Neighbor Advertisement message with FQDN
      option to 6DNAC Client-B to defend its duplicate FQDN detection.

  #9. 6DNAC Client-A times out and observes that there is no response to
      defend its duplicate FQDN detection procedure and the node is 
      successful in configuring its domain name.

  #10. 6DNAC Client-B observes that there is a NA with FQDN option
       indicating that the domain name is duplicate and enters Retry
       Mode. In retry mode, 6DNAC Client constructs another FQDN based
       on Host Naming Algorithm. The number of retries is defined by the
       administrator and must be a configurable value.
  









Park & Madanapalli             Expires October 2003            [Page 18]

INTERNET-DRAFT     IPv6 Extensions for DNS Plug and Play      April 2003  
  
  7.2.4. Domain Name Registration in Retry Mode

  Pre-Conditions:

  1. Duplicate Address Detection has succeeded 
  2. Duplicate FQDN Detection FAILED
  3. FQDN is the first FQDN one constructed and FAILED
  4. FQDN2 is the second FQDN to be constructed
  5. The Neighbor Solicitation in the 'Retry Mode'
    carries unspecified address in its target field (NS*).

   +---------+      +---------+      +---------+
   | 6DNAC-C |      | 6DNAC-S |      |  DNS-S  |
   +----+----+      +----+----+      +----+----+
        |                |                |
        |--------+       |                |
    Construct    | #1    |                |
    new FQDN2    |       |                |
        |<-------+       |                |
        |                |                |
  DFQDND Restarts        |                |
        |                |                |
        |                |                |
        |    NS* With    |                |
        |    FQDN Opt    |                |
        |--------------->|                |
        |       #2       |                |
        |                |                |
        |            No Entry             |
        |                |------+         |
        |          Create FQDN  | #3      |
        |            <FQDN2,C>  |         |
        |                |<-----+         |
        |                |                |
        |                | Register FQDN2 |
        |                |--------------->|
        |                |       #4       |
        |                |                |
        |--------+       |                |
   No Response   | #5    |                |
  DFQDND-Success |       |                |
        |<-------+       |                |
        |                |                |
        v                V                v

                
                <Figure: 11 Regeneration of Domain Name>
                









Park & Madanapalli             Expires October 2003            [Page 19]

INTERNET-DRAFT     IPv6 Extensions for DNS Plug and Play      April 2003
 
  #1. 6DNAC Client constructs the FQDN again as per Host Naming Algorithm,
      the DNS Zone Suffix, and it is FQDN2.
  #2. It then starts Duplicate Detection only for Domain Name. 6DNAC
      Client sends out NS with FQDN option and unspecified target
      address.

  #3. 6DNAC Server processes the Retry Mode NS message and finds that
      the FQDN2 is not in use and creates Cache entry as <FQDN2, C>.

  #4. It then starts registration procedures with the DNS Server.

  #5. Meanwhile, 6DNAC Client timesout and observes that there is no
      defending NA for its DFQDND NS sent out and successfully
      configures its domain name.


  7.2.5. Domain Name Registration when DAD Fails

  Duplicate domain name detection and subsequent registration starts 
  if and only if the DAD for IPv6 address succeeds. If the DAD for
  IPv6 address fails then no actions are taken for domain name. When
  DAD fails for stateless address autoconfiguration, then the domain
  configuration starts only when the address has been configured using 
  Stateful Address Configuration methods and the node is going on DAD
  for this address.

  This scenario starts when a 6DNAC Client receives RA message with
  DNS Zone Suffix and other parameters including address prefix as
  specified in NDP [2461] and wants configure its IPv6 address (Global
  or Site Local) and domain name.



























Park & Madanapalli             Expires October 2003            [Page 20]

INTERNET-DRAFT     IPv6 Extensions for DNS Plug and Play      April 2003

   +---------+      +---------+      +---------+      +---------+
   | 6DNAC-A |      | 6DNAC-S |      | 6DNAC-B |      |  DNS-S  |
   +----+----+      +----+----+      +----+----+      +----+----+
        |                |                |                |
        |                |                |                |
        |     RA with    |                |                |
        | DNS Suffix Opt |                |                |
        |<---------------|                |                |
        |       #1       |                |                |
        |-----+          |                |                |
    Construct |          |                |                |
      FQDN&   | #2       |                |                |
    IPv6 Addr |          |                |                |
        |<----+          |                |                |
 DAD/DFQDND Starts       |                |                |
        |                |                |                |
        |                |                |                |
        |    NS with     |                |                |
        |    FQDN Opt    |                |                |
        |--------------->+--------------->|                |
        |       #3       |        #3      |                |
        |            No Entry             |                |
        |                |------+         |                |
        |          Create FQDN  |         |                |
        |            <FQDN,A>   | #4      |                |
        |                |<-----+         |                |
        |                |                |                |
        |                |                |------+         |
        |                |           My IPv6 Addr| #5      |
        |                |                |<-----+         |
        |                |   Defend DAD   |                |
        |                |    with NA     |                |
        |<---------------+<---------------|                |
        |      #6        |       #6       |                |
        |              Entry              |                |
        |                |------+         |                |
        |          Delete FQDN  | #7      |                |
        |                |<-----+         |                |
        |                |                |                |
        |----+           |                |                |
  DAD Failed | #8        |                |                |
 Stop DFQDND |           |                |                |
        |<---+           |                |                |
        |                |                |                |
        v                v                v                v

                     <Figure: 12 DAD failure>

  #1. 6DNAC Server sends out Router Advertisement to 6DNAC Client-A.

  #2. 6DNAC Client-A constructs IPv6 Address based on the prefix and
      FQDN as per Host Naming Algorithm. 

  #3. It then starts Duplicate address & FQDN Detection, for the newly 
      constructed IPv6 address and FQDN, and sends out DAD/DFQDND NS
      with FQDN option.