NAME

        SV_RFC2181_10_2_RRSet_PTR - RRSet for PTR record

VERIFICATION POINTS

        Verify that a NUT transmits response including RRSet for PTR resource record

Confusion about canonical names has lead to a belief that a PTR record should have exactly one RR in its RRSet. This is incorrect, the relevant section of RFC1034 (section 3.6.2) indicates that the value of a PTR record should be a canonical name. That is, it should not be an alias. There is no implication in that section that only one PTR record is permitted for a name. No such restriction should be inferred.

TARGET

        Authoritative Server

SYNOPSIS

	SV_RFC2181_10_2_RRSet_PTR.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
B	IN	A	192.168.1.10

Example of 1.168.192.IN-ADDR.ARPA domain zone file:

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

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (TN)                       DNS Server1 (NUT)
        |                                      |
        |------------------------------------->|
        |   1. Send standard query             |
        |      QNAME=10.1.168.192.IN-ADDR.ARPA |
        |      QTYPE=PTR                       |
        |                                      |
        |<-------------------------------------|
        |   2. Standard query response         |
        |                                      |
        |                                      |
        v                                      v

        1. TN send standard query QNAME=10.1.168.192.IN-ADDR.ARPA, QTYPE=PTR to NUT.
        2. NUT reply query response w/ PTR=A.example.com, B.example.com 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	10.1.168.192.IN-ADDR.ARPA
	QTYPE	PTR (0x000C)
	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	1
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	2
	NSCOUNT	1
	ARCOUNT	1
DNS Question section	QNAME	10.1.168.192.IN-ADDR.ARPA
	QTYPE	PTR (0x000C)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	10.1.168.192.IN-ADDR.ARPA (Pointer 0xC00C)
	TYPE	PTR (0x000C)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	15
	PTRDNAME	A.example.com
DNS Answer section	NAME	10.1.168.192.IN-ADDR.ARPA (Pointer 0xC00C)
	TYPE	PTR (0x000C)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	PTRDNAME	B.example.com (B + Pointer 0xC039)
DNS Authority section	NAME	1.168.192.IN-ADDR.ARPA (Pointer 0xC00F)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	6
	NSDNAME	NS1.example.com (NS1 + Pointer 0xC039)
DNS Additional section	NAME	NS1.example.com (Pointer 0xC062)
	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 including RRSet for PTR resource record.

TERMINATION

        None

REFERENCE

        RFC2181 Clarifications to the DNS Specification
        10.2. PTR records