NAME

        SV_RFC2671_5_1_OPT_presence - The presence of an OPT pseuduo-RR

VERIFICATION POINTS

        Verify that a NUT takes the presence of an OPT pseudo-RR in a request
        as an indication that the requestor fully implements the given version of EDNS.

The presence of an OPT pseudo-RR in a request should be taken as an indication that the requestor fully implements the given version of EDNS, and can correctly understand any response that conforms to that feature's specification.

TARGET

        Authoritative Server

SYNOPSIS

	SV_RFC2671_5_1_OPT_presence.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.

Set the DNS Server1's (NUT) EDNS UDP size to 1024.

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	AAAA	3ffe:501:ffff:101::10

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (TN)                       DNS Server1 (NUT)
        |                                      |
        |------------------------------------->|
        |   1. Send standard query             |
        |       QNAME=A.example.com            |
        |       QTYPE=AAAA                     |
        |       ADDITIONAL UDP payload size    |
        |        = 1024                        |
        |                                      |
        |<-------------------------------------|
        |   2. Standard query response         |
        |       AAAA=3ffe:501:ffff:101::10     |
        |       ADDITIONAL UDP payload size    |
        |        = 1024                        |
        |                                      |
        v                                      v

        1. TN send standard query QNAME=A.example.com, QTYPE=AAAA w/ EDNS0 to NUT.
        2. NUT reply query response w/ AAAA=3ffe:501:ffff:101::10 w/ EDNS0 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	1
DNS Question section	QNAME	A.example.com
	QTYPE	AAAA (0x001C)
	QCLASS	IN (0x0001)
DNS Additional section	NAME	empty (root domain)
	TYPE	OPT (0x0029)
	CLASS	1024
	EXTENDED-RCODE	0
	VERSION	0
	Z	0
	RDLENGTH	0

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	1
	NSCOUNT	1
	ARCOUNT	2
DNS Question section	QNAME	A.example.com
	QTYPE	AAAA (0x001C)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	A.example.com (Pointer 0xC00C)
	TYPE	AAAA (0x001C)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	16
	ADDRESS	3ffe:501:ffff:101::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 0xC047)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.0.10
DNS Additional section	NAME	empty (root domain)
	TYPE	OPT (0x0029)
	CLASS	1024
	EXTENDED-RCODE	0
	VERSION	0
	Z	0
	RDLENGTH	0

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 OPT pseudo-RR.

TERMINATION

        None

REFERENCE

        RFC1034 DOMAIN NAMES - CONCEPTS AND FACILITIES
        3.6 Resource Records

        RFC1035 DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION
        3.2.1 Format

        RFC 2671 EDNS0
        5. Transport Considerations