MoinQ: DNS/返答/RCODE

1. DNS/RCODE

https://tools.ietf.org/html/rfc2929 (BCP 42)

http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml

http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-6

• https://www.icann.org/en/system/files/files/sac-032-en.pdf

  • Preliminary Report on DNS Response Modification

/SERVFAIL

2. 最初の 16 こ

0       NoError   No Error      [RFC1035]
1       FormErr   Format Error  [RFC1035]
2       ServFail  Server Failure        [RFC1035]
3       NXDomain  Non-Existent Domain   [RFC1035]
4       NotImp    Not Implemented       [RFC1035]
5       Refused   Query Refused         [RFC1035]
6       YXDomain  Name Exists when it should not [RFC2136][RFC6672]
7       YXRRSet   RR Set Exists when it should not      [RFC2136]
8       NXRRSet   RR Set that should exist does not     [RFC2136]
9       NotAuth   Server Not Authoritative for zone     [RFC2136]
9       NotAuth   Not Authorized        [RFC2845]
10      NotZone   Name not contained in zone    [RFC2136]
11-15   Unassigned      

-- ToshinoriMaeno 2015-05-05 22:53:21

4.1.1. ヘッダ節形式 Header section format

The header contains the following fields:

ヘッダーにあるフィールド：

                                    1  1  1  1  1  1
      0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                      ID                       |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |QR|   Opcode  |AA|TC|RD|RA|   Z    |   RCODE   |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    QDCOUNT                    |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    ANCOUNT                    |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    NSCOUNT                    |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    ARCOUNT                    |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

http://tools.ietf.org/html/rfc2136 Dynamic Updates in the Domain Name System (DNS UPDATE)

RCODE           Response code - this 4 bit field is set as part of
                responses.  The values have the following
                interpretation:
    
                0               No error condition
    
                1               Format error - The name server was
                                unable to interpret the query.

                2               Server failure - The name server was
                                unable to process this query due to a
                                problem with the name server.

                3               Name Error - Meaningful only for
                                responses from an authoritative name
                                server, this code signifies that the
                                domain name referenced in the query does
                                not exist.