NAME

        SV_RFC1034_3_6_CNAME_rdata - Resource record of CNAME type

VERIFICATION POINTS

        Verify that a NUT transmits correct message including CNAME resource record.

Single canonical or primary name for the owner case.

Header section field has the following value.

QR : 1

QDCOUNT : 1

ANCOUNT : 1

CNAME RDATA format

+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
/                     CNAME                     /
/                                               /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

CNAME :

A <domain-name> which specifies the canonical or primary name for the owner.
The owner name is an alias.

TARGET

        Authoritative Server

SYNOPSIS

	SV_RFC1034_3_6_CNAME_rdata.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

Network Topology

        AP Server1 (TN)
          |3ffe:501:ffff:101::10
          |192.168.1.11,12
          |
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
;
A2	IN	A	192.168.1.12
B1	IN	CNAME	A2

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (TN)                       DNS Server1 (NUT)
        |                                      |
        |------------------------------------->|
        |   1. Send standard query             |
        |       QNAME=B1.example.com           |
        |       QTYPE=A                        |
        |                                      |
        |<-------------------------------------|
        |   2. Standard query response         |
        |       CNAME=A2.example.com           |
        |       A=192.168.1.12                 |
        |                                      |
        |------------------------------------->|
        |   3. Send standard query to NUT      |
        |       QNAME=B1.example.com           |
        |       QTYPE=CNAME                    |
        |                                      |
        |<-------------------------------------|
        |   4. Standard query response         |
        |       CNAME=A2.example.com           |
        |                                      |
        v                                      v

        1. TN send standard query QNAME=B1.example.com, QTYPE=A to NUT.
        2. NUT reply query response including CNAME=A2.example.com, A=192.168.1.12 to TN (Judgment *2)
        3. TN send standard query QNAME=B1.example.com, QTYPE=CNAME to NUT.
        4. NUT reply query response including CNAME=A2.example.com to TN (Judgment *4)

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	B1.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	ANY
	TC	0
	RD	1
	RA	ANY
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	2
	NSCOUNT	1
	ARCOUNT	1
DNS Question section	QNAME	B1.example.com
	QTYPE	A (0x0001)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	B1.example.com (Pointer 0xC00C)
	TYPE	CNAME (0x0005)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	5
	CNAME	A2.example.com (A2 + Pointer 0xC00F)
DNS Answer section	NAME	A2.example.com (Pointer 0xC02C)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.12
DNS Authority section	NAME	example.com (Pointer 0xC00F)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	6
	NSDNAME	NS1.example.com (NS1 + Pointer 0xC00F)
DNS Additional section	NAME	NS1.example.com (Pointer 0xC04D)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.0.10

3rd 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	2001
UDP Header	Dst Port	53
DNS Header	ID	0x1001
	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	B1.example.com
	QTYPE	CNAME (0x0005)
	QCLASS	IN (0x0001)

4th 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	ANY
	TC	0
	RD	1
	RA	ANY
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	NSCOUNT	1
	ARCOUNT	1
DNS Question section	QNAME	B1.example.com
	QTYPE	CNAME (0x0005)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	B1.example.com (Pointer 0xC00C)
	TYPE	CNAME (0x0005)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	5
	CNAME	A2.example.com (A2 + Pointer 0xC00F)
DNS Authority section	NAME	example.com (Pointer 0xC00F)
	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 0xC03d)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.0.11

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 including CNAME and A resource record.
        4. Received standard query response including CNAME resource record.

TERMINATION

        None

REFERENCE

        RFC1034 DOMAIN NAMES - CONCEPTS AND FACILITIES
        3.6 Resource Records
        4.3.2. Algorithm

        RFC1035 DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION
        3.2.1 Format 
        3.2.2 TYPE values 
        3.3.1 CNAME RDATA format

        RFC2181 Clarifications to the DNS Specification
        10.1. CNAME resource records