NAME

        SV_RFC3404_4_5_NAPTR_flag_S_additional - Additional Section Processing for NAPTR resource record (S flag)

VERIFICATION POINTS

        Verify that a NUT transmits correct message including SRV record in Additional Section related to NAPTR record

DNS servers MAY interpret Flag values and use that information to include appropriate SRV and A records in the Additional Information portion of the DNS packet.

DNS servers MAY add RRsets to the additional information section that are relevant to the answer and have the same authenticity as the data in the answer section. Generally this will be made up of A and SRV records but the exact records depends on the application.

TARGET

        Authoritative Server

SYNOPSIS

	SV_RFC3404_4_5_NAPTR_flag_S_additional.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 
           3ffe:501:ffff:100::10
           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 NAPTR 100  50  "S"    "http+N2L+N2C+N2R"  ""   _http._tcp.example.com.
;
_http._tcp      IN      SRV     10      20      80      www.example.com.
;
NS1	IN	A	192.168.0.10
;
WWW	IN	A	192.168.1.10

Example of cid.urn.arpa. domain zone file:

$TTL	86400		; TTL of 1 day
@ IN SOA NS1.example.com. root.example.com. (
	2005081600	; serial
	3600		; refresh after 1 hr
	900		; retry after 15 min
	604800		; expire after 1 week
	3600		; Minimum TTL of 1 hr
)
;
	IN	NS	NS1.example.com.
;
cid.urn.arpa. IN NAPTR 100 10 "" ""  "!^urn:cid:.+@([^\\.]+\\.)(.*)$!\\2!i" .

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (TN)                       DNS Server1 (NUT)
        |                                      |
        |------------------------------------->|
        |   1. Send standard query             |
        |      QNAME = cid.urn.arpa.           |
        |      QTYPE= NAPTR                    |
        |                                      |
        |<-------------------------------------|
        |   2. Standard query response         |
        |                                      |
        |------------------------------------->|
        |   3. Send standard query             |
        |      QNAME = example.com.            |
        |      QTYPE= NAPTR                    |
        |                                      |
        |<-------------------------------------|
        |   4. Standard query response         |
        |                                      |
        v                                      v

        1. TN send standard query
           QNAME=cid.urn.arpa.,
           QTYPE=NAPTR to NUT.
        2. NUT reply query response w/ NAPTR resource record to TN (Judgment *2)
        3. TN send standard query
           QNAME=example.com.,
           QTYPE=NAPTR to NUT.
        4. NUT reply query response w/ NAPTR resource record in Answer Section 
           and w/ SRV resource record in Additional Section 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	cid.urn.arpa.
	QTYPE	NAPTR (0x0023)
	QCLASS	IN (0x0001)

2nd packet.

Standard query response from DNS Server1 (NUT) to Client (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	0
	RA	0
	Z	ANY
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	NSCOUNT	1
	ARCOUNT	1
DNS Question section	QNAME	cid.urn.arpa.
	QTYPE	NAPTR (0x0023)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	cid.urn.arpa. (Pointer 0xC00C)
	TYPE	NAPTR (0x0023)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	41
	ORDER	100
	PREFERENCE	10
	FLAGS
	SERVICES
	REGEXP	!^urn:cid:.+@([^\.]+\.)(.*)$!\2!i
	REPLACEMENT	.
DNS Authority section	NAME	cid.urn.arpa. (Pointer 0xC00C)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	17
	NSDNAME	NS1.example.com
DNS Additional section	NAME	NS1.example.com (Pointer 0xC05F)
	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	2000
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	example.com.
	QTYPE	NAPTR (0x0023)
	QCLASS	IN (0x0001)

4th packet.

Standard query response from DNS Server1 (NUT) to Client (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	0x1001
	QR	1
	OPCODE	0
	AA	1
	TC	0
	RD	0
	RA	0
	Z	ANY
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	NSCOUNT	1
	ARCOUNT	2
DNS Question section	QNAME	example.com
	QTYPE	NAPTR (0x0023)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	example.com. (Pointer 0xC00C)
	TYPE	NAPTR (0x0023)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	48
	ORDER	100
	PREFERENCE	50
	FLAGS	S
	SERVICES	http+N2L+N2C+N2R
	REGEXP
	REPLACEMENT	_http._tcp.example.com.
DNS Authority 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 Additional section	NAME	NS1.example.com (Pointer 0xC065)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.0.10
DNS Additional section	NAME	_http._tcp.example.com.(Pointer 0xC041)
	TYPE	SRV (0x0021)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	23
	Priority	10
	Weight	20
	Port	80
	Target	www.example.com.

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 NAPTR resource record.
        4. Received standard query response including NAPTR resource record in Answer Section 
           and SRV resource record in Additional Section.
           *SRV resource record must be included in Additional Section.

TERMINATION

        None

REFERENCE

        RFC3403 Dynamic Delegation Discovery System (DDDS)
                Part Three: The Domain Name System (DNS) Database
        4.2.1 Additional Section Processing by DNS Servers

        RFC3403 Dynamic Delegation Discovery System (DDDS)
                Part Four: The Uniform Resource Identifiers (URI)
                Resolution Application
        4.5 Valid Databases