NAME

        SV_RFC2782_SRV_rdata - Resource record of SRV type

VERIFICATION POINTS

        Verify that a NUT transmits correct message including SRV resource record

Single host address case.

Header section field has the following value.

QR : 1

QDCOUNT : 1

ANCOUNT : 1

SRV RDATA format

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Priority                      | Weight                        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port                          | Target ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

Priority :	The priority of this target host. A client MUST attempt to contact the target host with the lowest-numbered priority it can reach. This is a 16 bit unsigned integer in network byte order.
Weight :	The weight field specifies a relative weight for entries with the same priority. Larger weights SHOULD be given a proportionately higher probability of being selected. This is a 16 bit unsigned integer in network byte order.
Port :	The port on this target host of this service. This is a 16 bit unsigned integer in network byte order.
Target :	The domain name of the target host. A Target of "." means that the service is decidedly not available at this domain.

TARGET

        Authoritative Server

SYNOPSIS

	SV_RFC2782_SRV_rdata.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

Network Topology

        AP Server1 (TN)            AP Server2 (TN)
          |www1.example.com.         |www2.example.com.
          |3ffe:501:ffff:101::10     |3ffe:501:ffff:101::20
          |192.168.1.10              |192.168.1.20
          |                          |
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
;
_http._tcp	IN	SRV	10	20	80	www1.example.com.
		IN	SRV	11	21	81	www2.example.com.
www1	IN	A	192.168.1.10
www2	IN	A	192.168.1.20

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (TN)                       DNS Server1 (NUT)
        |                                      |
        |------------------------------------->|
        |   1. Send standard query             |
        |       QNAME = _http._tcp.example.com.|
        |       QTYPE = SRV                    |
        |                                      |
        |<-------------------------------------|
        |   2. Standard query response         |
        |       QNAME = _http._tcp.example.com.|
        |       QTYPE = SRV                    |
        |       ANSWER                         |
        |        Priority = 10                 |
        |        Weight = 20                   |
        |        Port = 80                     |
        |        Target = www1.example.com.    |
        |       ANSWER                         |
        |        Priority = 11                 |
        |        Weight = 21                   |
        |        Port = 81                     |
        |        Target = www2.example.com.    |
        |       Authority Name                 |
        |        = example.com.                |
        |       AUTHORITY Name Server          |
        |        = NS1.example.com.            |
        |       ADDITIONAL Name                |
        |        = www1.example.com.           |
        |       ADDITIONAL Address             |
        |        = 192.168.1.10                |
        |       ADDITIONAL Name                |
        |        = www2.example.com.           |
        |       ADDITIONAL Address             |
        |        = 192.168.1.20                |
        |       ADDITIONAL Name                |
        |        = NS1.example.com.            |
        |       ADDITIONAL Address             |
        |        = 192.168.0.10                |
        |                                      |
        v                                      v

        1. TN send standard query QNAME=_http._tcp.example.com., QTYPE=SRV to NUT.
        2. NUT reply query response w/ SRV=10 20 80 www1.example.com.
           and SRV=11 21 81 www2.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	_http._tcp.example.com.
	QTYPE	SRV (0x0021)
	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	3
DNS Question section	QNAME	_http._tcp.example.com.
	QTYPE	SRV (0x0021)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	_http._tcp.example.com. (Pointer 0xC00C)
	TYPE	SRV (0x0021)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	24
	Priority	10
	Weight	20
	Port	80
	Target	www1.example.com.
DNS Answer section	NAME	_http._tcp.example.com. (Pointer 0xC00C)
	TYPE	SRV (0x0021)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	24
	Priority	11
	Weight	21
	Port	81
	Target	www2.example.com.
DNS Authority section	NAME	example.com. (Pointer 0xC063)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	6
	NSDNAME	NS1.example.com. (NS1 + Pointer 0xC063)
DNS Additional section	NAME	www1.example.com. (Pointer 0xC03A)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.10
DNS Additional section	NAME	www2.example.com. (Pointer 0xC05E)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.20
DNS Additional section	NAME	NS1.example.com. (Pointer 0xC07C)
	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 SRV type record.

TERMINATION

        None

REFERENCE

        RFC1034 DOMAIN NAMES - CONCEPTS AND FACILITIES
        3.6 Resource Records

        RFC1035 DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION
        3.2.1 Format

        RFC2782 DNS SRV RR