NAME

        SV_RFC1034_4_3_2_23A1_1 - Recursion service is available and requested via the RD bit in the query

VERIFICATION POINTS

        Verify that whether NUT's behavior. Recursion service is avairable but not requested 
        via the RD bit in the query. Search the available zones for the zone which is the nearest
        ancestor to QNAME. Such a zone is found and the whole of QNAME is matched, the data at 
        the node is a CNAME, and QTYPE doesn't match CNAME case.

TARGET

        Server

SYNOPSIS

	SV_RFC1034_4_3_2_23A1_1.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

Network Topology

        AP Server1 (TN)
          |A.example.org
          |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.

Enable recursive mode.

Example of root server list:

For IPv4:

.                       3600000         IN      NS      A.ROOT.NET.
A.ROOT.NET.             3600000                 A       192.168.1.20

For IPv6:

.                       3600000         IN      NS      A.ROOT.NET.
A.ROOT.NET.             3600000                 AAAA    3ffe:501:ffff:101::20

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
B	IN	CNAME	A.example.com.

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (TN)             DNS Server1 (NUT)
        |                              |
        |----------------------------->|
        | 1. Send standard query       |
        |  RD = 0                      |
        |  QNAME = B.example.com       |
        |  QTYPE = A                   |
        |                              |
        |                              |
        |<-----------------------------|
        | 2. Standard query response   |
        |  RD = 0                      |
        |  RA = 1                      |
        |  AA = 1                      |
        |  QNAME = B.example.com       |
        |  QTYPE = A                   |
        |  ANSWER Name                 |
        |         = B.example.com      |
        |  ANSWER Type                 |
        |         = CNAME (0x0005)     |
        |  ANSWER Primary Name         |
        |         = A.example.com      |
        |  ANSWER Name                 |
        |         = A.example.com      |
        |  ANSWER Type                 |
        |         = A (0x0001)         |
        |  ANSWER Address              |
        |         = 192.168.1.10       |
        |  AUTHORITY Name              |
        |         = example.com        |
        |  AUTHORITY Type              |
        |         = NS (0x0002)        |
        |  AUTHORITY Name Server       |
        |         = NS1.example.com    |
        |  ADDITIONAL Name             |
        |         = NS1.example.com    |
        |  ADDITIONAL Type             |
        |         = A (0x0001)         |
        |  ADDITIONAL Address          |
        |         = 192.168.0.10       |
        |                              |
        v                              v

        1. DNS Client1 (TN) send standard query QNAME=B.example.com with RD=0 to DNS Server1 (NUT).
        2. DNS Server1 (NUT) transmits standard query response from which RA bit is set to DNS Client1 (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	1000
UDP Header	Dst Port	53
DNS Header	ID	0x1000
	QR	0
	OPCODE	0
	AA	0
	TC	0
	RD	0
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	0
	ARCOUNT	0
DNS Question section	QNAME	B.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	1000
DNS Header	ID	0x1000
	QR	1
	OPCODE	0
	AA	1
	TC	0
	RD	0
	RA	1
	Z	ANY
	RCODE	0
	QDCOUNT	1
	ANCOUNT	2
	NSCOUNT	1
	ARCOUNT	1
DNS Question section	QNAME	B.example.com
	QTYPE	A (0x0001)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	B.example.com (Pointer 0xC00C)
	TYPE	CNAME (0x0005)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	Primary Name	A.example.com (A + Pointer 0xC00E)
DNS Answer section	NAME	A.example.com (Pointer 0xC031)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	Address	192.168.1.10
DNS Authority section	NAME	example.com (Pointer 0xC00E)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	6
	NSDNAME	NS1.example.com (NS1 + Pointer 0xC00E)
DNS Additional section	NAME	NS1.example.com (Pointer 0xC053)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.0.10

Exp.

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

JUDGMENT

        2. Received standard query response from which RA bit is set and CNAME is included in Answer.

TERMINATION

        None

REFERENCE

        RFC1034 DOMAIN NAMES - CONCEPTS AND FACILITIES
        4. NAME SERVERS
        4.3.2. Algorithm