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<<Navigation(children,1)>>
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== DNS/RCODE ==
<<TableOfContents()>>

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]]
== 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 <<DateTime(2015-05-06T07:53:21+0900)>>

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.
}}}