NAME

        CL_RFC1034_5_2_return_answer - Returning of answer

VERIFICATION POINTS

        Verify that a NUT uses the returned RR

When the resolver performs the indicated function, it usually has one of

the following results to pass back to the client:

One or more RRs giving the requested data

TARGET

        Client

SYNOPSIS

	CL_RFC1034_5_2_return_answer.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

• Network Topology

        AP Server1(TN):B.example.com     DNS Server1(TN)
          |3ffe:501:ffff:101::60           |3ffe:501:ffff:101::20
          |192.168.1.60                    |192.168.1.20
          |                                |
Net-y   --+--------+-----------------------+-------- 3ffe:501:ffff:101::/64 
                   |                                 192.168.1/24
                   |
                   |
                 ROUTER1(TN)
                   |3ffe:501:ffff:100::1
                   |192.168.0.1
                   |
Net-z   --+--------+-------------------------------- 3ffe:501:ffff:100::/64 
          |                                          192.168.0/24
        DNS Client1(NUT)
           3ffe:501:ffff:100:XXXX
           192.168.0.10
	

	XXXX: EUI64 address
	

• Setup

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

• Pre-Sequence

	In order to send the query for A type(IN class) of AP Server1(TN):B.example.com to the DNS Server1(TN), 
	NUT send Echo Request(Echo Message) to AP Server1(TN):B.example.com.
	

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (NUT)                        DNS Server1 (TN)                               AP Server1 (TN)
        |                                              |                                              |
        |--------------------------------------------->|                                              |
        |           1. Send standard query             |                                              |
        |              QNAME=B.example.com             |                                              |
        |                                              |                                              |
        |<---------------------------------------------|                                              |
        |           2. Standard query response         |                                              |
        |                                              |                                              |
        |----------------------------------------------|--------------------------------------------->|
        |           3. Echo Request(Echo Message)      |                                              |
        |                                              |                                              |
        v                                              v                                              v

        1. NUT send standard query to DNS Server1(TN).
                  Judgment (Check *1)
        2. TN send standard query response to NUT.
        3. NUT send Echo Request(Echo Message) to to AP Server1(TN).
                  Judgment (Check *3)

• Packet Description

1st Packet

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


2nd packet.

2. Standard query response from DNS Server1 (TN) to Client1 (NUT)
IP Header	Source Address	SV_NETY
	Destination Address	NUT_NETZ
UDP Header	Src Port	53
	Dst Port	Same as 1st Packet's Src Port
DNS Header	ID	Same as 1st Packet's ID
	QR	1
	OPCODE	0
	AA	1
	TC	0
	RD	Same as 1st Packet's RD
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	NSCOUNT	0
	ARCOUNT	0
DNS Question section	QNAME	B.example.com
	QTYPE	A (0x0001)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	B.example.com (Pointer 0xC00C)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.60


3rd Packet

3. Standard Echo Request(Echo Message) from DNS Client1 (NUT) to AP Server1 (TN)
IP Header	Source Address	NUT_NETZ
	Destination Address	AP_NETY
ICMP	Type	8(Echo Message for IPv4)/128(Echo Request for IPv6)


Exp.


NUT_NETZ	DNS Client1's (NUT) Net-z address
SV_NETY	DNS Server1's (TN) Net-y address
AP_NETY	AP Server1's (TN) Net-y address

JUDGMENT

        1. Received standard query QNAME=B.example.com from NUT.
        3. Received Echo Request(Echo Message) from NUT.

TERMINATION

        If NUT has cache function, clear the cache.

REFERENCE

	RFC1035 DOMAIN NAMES - CONCEPTS AND FACILITIES
	5.2.1. Typical functions