NAME

        SV_RFC1035_4_1_Header - Header section format(response)

VERIFICATION POINTS

        Verify that a NUT transmits correct Header section format in response

Header section format (response)

	                                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                    |
	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

ID : same as query's ID

QR : response (1)

Opcode : a standard query(QUERY) (0)

AA : 1

TC : 0

RD : 1

RCODE : 0

QDCOUNT : 1

ANCOUNT : 1

NSCOUNT : 1

ARCOUNT : 1

TARGET

        Authoritative Server

SYNOPSIS

	SV_RFC1035_4_1_Header.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

Network Topology

        AP Server1 (TN)
          |3ffe:501:ffff:101::10
          |192.168.1.10
          |
Net-y   --+--------+-------------------------- 3ffe:501:ffff:101::/64 
                   |                           192.168.1/24
                   |
                   |
                 Router (TN)
                   |3ffe:501:ffff:100::1
                   |192.168.0.1
                   |
                   |
Net-z   --+--------+-----------------+-------- 3ffe:501:ffff:100::/64 
          |                          |          192.168.0/24
          |                          |
        DNS Server1 (NUT)            DNS Client1 (TN)
           3ffe:501:ffff:100::XXXX     3ffe:501:ffff:100::20 
           192.168.0.10                192.168.0.20
	

	XXXX: EUI64

Setup

Set the DNS Server1's (NUT) address as above mentioned Network Topology.

Configure the Server1's (NUT) zone file to response query from TN.

Example of example.com zone file:

$TTL    86400           ; TTL of 1 day
@ IN SOA NS1.example.com. root.example.com. (
	2005081600	; serial
	3600		; refresh every 1 hr
	900		; retry every 15 min
	604800		; expire after a week
	3600		; Minimum TTL of a 1 hr
)
;
	IN	NS	NS1.example.com.
NS1	IN	A	192.168.0.10
;
A	IN	A	192.168.1.10

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (TN)                       DNS Server1 (NUT)
        |                                      |
        |------------------------------------->|
        |   1. Send standard query             |
        |       QNAME=A.example.com            |
        |       QTYPE=A                        |
        |                                      |
        |<-------------------------------------|
        |   2. Standard query response         |
        |       A=192.168.1.10                 |
        |                                      |
        v                                      v

        1. TN send standard query QNAME=A.example.com, QTYPE=A to NUT.
        2. NUT reply query response w/ A=192.168.1.10 to TN (Judgment *2)

Packet Description

1st packet.

Standard query from DNS Client1 (TN) to Server1 (NUT)
IP Header	Source Address	CL1_NETZ
IP Header	Destination Address	NUT_NETZ
UDP Header	Src Port	2000
UDP Header	Dst Port	53
DNS Header	ID	0x1000
	QR	0
	OPCODE	0
	AA	0
	TC	0
	RD	1
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	0
	ARCOUNT	0
DNS Question section	QNAME	A.example.com
	QTYPE	A (0x0001)
	QCLASS	IN (0x0001)

2nd packet.

Standard query response from DNS Server1 (NUT) to Client1 (TN)
IP Header	Source Address	NUT_NETZ
IP Header	Destination Address	CL1_NETZ
UDP Header	Src Port	53
UDP Header	Dst Port	2000
DNS Header	ID	0x1000
	QR	1
	OPCODE	0
	AA	1
	TC	0
	RD	1
	RA	any
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	NSCOUNT	1
	ARCOUNT	1
DNS Question section	QNAME	any
	QTYPE	any
	QCLASS	any
DNS Answer section	NAME	any
	TYPE	any
	CLASS	any
	TTL	any
	RDLENGTH	any
	ADDRESS	any
DNS Authority section	NAME	any
	TYPE	any
	CLASS	any
	TTL	any
	RDLENGTH	any
	NSDNAME	any
DNS Additional section	NAME	any
	TYPE	any
	CLASS	any
	TTL	any
	RDLENGTH	any
	ADDRESS	any

Exp.

NUT_NETZ	DNS Server1's (NUT) Net-z address
CL1_NETZ	DNS Client1's (TN) Net-z address

JUDGMENT

        2. Standard query response must be based on above Verification Points.

TERMINATION

        None

REFERENCE

        RFC1035 DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION
        4.1.1. Header section format