NAME

        SV_RFC2181_5_5_once_RRSet - A Resource Record Set should only be included once in any DNS reply.

VERIFICATION POINTS

        Verify that a NUT includes only one RRset to response.

A Resource Record Set should only be included once in any DNS reply. It may occur in any of the Answer, Authority, or Additional Information sections, as required. However it should not be repeated in the same, or any other, section, except where explicitly required by a specification.

TARGET

        Authoritative Server

SYNOPSIS

	SV_RFC2181_5_5_once_RRSet.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.
	IN	NS	NS2.example.com.
NS1	IN	A	192.168.0.10
NS2	IN	A	192.168.0.11
;
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=example.com              |
        |       QTYPE=NS                       |
        |                                      |
        |<-------------------------------------|
        |   2. Standard query response         |
        |       QNAME Name=example.com         |
        |       OTYPE=NS                       |
        |       ANSWER Name=example.com        |
        |       ANSWER Nsdname=NS1.example.com |
        |       ANSWER Name=example.com        |
        |       ANSWER Nsdname=NS2.example.com |
        |       ADDITIONAL Name=NS1.example.com|
        |       ADDITIONAL ADDRESS=192.168.0.10|
        |       ADDITIONAL Name=NS2.example.com|
        |       ADDITIONAL ADDRESS=192.168.0.11|
        |                                      |
        v                                      v

        1. TN send standard query QNAME=example.com, QTYPE=NS to NUT.
        2. NUT reply query response w/ NSDNAME=NS1.example.com, NS2.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	example.com
	QTYPE	NS (0x0002)
	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	2
	NSCOUNT	0
	ARCOUNT	2
DNS Question section	QNAME	example.com
	QTYPE	NS (0x0002)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	example.com (Pointer 0xC00C)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	6
	NSDNAME	NS1.example.com (NS1 + Pointer 0xC00C)
DNS Answer section	NAME	example.com (Pointer 0xC00C)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	6
	NSDNAME	NS2.example.com (NS2 + Pointer 0xC00C)
DNS Additional section	NAME	NS1.example.com (Pointer 0xC029)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.0.10
DNS Additional section	NAME	NS1.example.com (Pointer 0xC035)
	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 that include only one RRset in Answer section.
        *Authority section must not include RRset same as Answer section's RRSet. 
        *Additional section is optional.

TERMINATION

        None

REFERENCE

        RFC2181 Clarifications to the DNS Specification
        5.5. Sending RRSets (reprise)