NAME

        CL_RFC2181_5_2_diff_nonauth - Differing TTLs from non-authoritative source

VERIFICATION POINTS

        Verify that a NUT treats as an error, when receive response containing RRs 
        from an RRSet with differing TTLs from a non-authoritative source.

Should a client receive a response containing RRs from an RRSet with
differing TTLs, it should treat this as an error. If the RRSet
concerned is from a non-authoritative source for this data, the
client should simply ignore the RRSet, and if the values were
required, seek to acquire them from an authoritative source. Clients
that are configured to send all queries to one, or more, particular
servers should treat those servers as authoritative for this purpose.

TARGET

        Client (with Caching function)

SYNOPSIS

	CL_RFC2181_5_2_diff_nonauth.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

• Network Topology

        AP Server1(TN):A.example.com     DNS Server1(TN)           DNS Server2(TN)
          |3ffe:501:ffff:101::10           |3ffe:501:ffff:101::20    |3ffe:501:ffff:101::30
          |192.168.1.10                    |192.168.1.20             |192.168.1.30
          |                                |                         |
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) 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):A.example.com to the DNS Server1(TN), 
	NUT is configured.
	

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (NUT)                        DNS Server1 (TN)                               DNS Server2 (TN)
        |                                              |                                              |
        |--------------------------------------------->|                                              |
        |           1. Send standard query             |                                              |
        |              QNAME=A.example.com             |                                              |
        |                                              |                                              |
        |<---------------------------------------------|                                              |
        |           2. Standard query response         |                                              |
        |              RRs with differing TTLs         |                                              |
        |                                              |                                              |
        |----------------------------------------------|--------------------------------------------->|
        |           3A. Send standard query            |                                              |
        |              QNAME=A.example.com             |                                              |
        |                                              |                                              |
        |--------------------------------------------->|--------------------------------------------->|
        |           3B. Send standard query            |                                              |
        |              QNAME=A.example.com             |                                              |
        v                                              v                                              v

        1. NUT send standard query to DNS Server1(TN). (Judgment *1)
        2. TN send standard query response to NUT.
        3A. NUT send standard query to DNS Server2(TN). *Don't specify the DNS Server2.
           *Send query automatically. (Judgment *3A)
        3B. NUT send standard query. (Judgment *3B)

        *3A or 3B is executed.

• 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	A.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	0
	TC	0
	RD	Same as 1st Packet's RD
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	2
	NSCOUNT	1
	ARCOUNT	1
DNS Question section	QNAME	A.example.com
	QTYPE	A (0x0001)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	A.example.com (Pointer 0xC00C)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.10
DNS Answer section	NAME	A.example.com (Pointer 0xC00C)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	2 day (172800)
	RDLENGTH	4
	ADDRESS	192.168.1.11
DNS Authority section	NAME	example.com (Pointer 0xC00E)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	6
	NSDNAME	NS2.example.com (NS2 + Pointer 0xC00E)
DNS Additional section	NAME	NS2.example.com (Pointer 0xC04B)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.30


3rd packet.

3A. Standard query from DNS Client1 (NUT) to DNS Server2 (TN)
IP Header	Source Address	NUT_NETZ
	Destination Address	SV2_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	A.example.com
	QTYPE	A (0x0001)
	QCLASS	IN (0x0001)



Exp.


NUT_NETZ	DNS Client1's (NUT) Net-z address
SV_NETY	DNS Server1's (TN) Net-y address
SV2_NETY	DNS Server2's (TN) Net-y address

JUDGMENT

        1. Received standard query QNAME=A.example.com from NUT to Server1(TN).
        3A. Received standard query QNAME=A.example.com from NUT to Server2(TN).
        3B. Received standard query QNAME=A.example.com from NUT to Server1(TN) or Server2(TN).
        *3A or 3B is judged.

TERMINATION

        If NUT has cache function, clear the cache.

REFERENCE

	RFC2181 Clarifications to the DNS Specification
	5.2. TTLs of RRs in an RRSet