NAME

        SV_RFC2782_SRV_type - Resource record SRV type

VERIFICATION POINTS

        Verify that a NUT transmits correct message including SRV type in the QTYPE field.

Query type SRV.

Header section field has the following value.

QR : 0

QDCOUNT : 1

ANCOUNT : 0

NSCOUNT : 0

ARCOUNT : ANY

Question section format

                                1  1  1  1  1  1
  0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|                                               |
/                     QNAME                     /
/                                               /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|                     QTYPE                     |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|                     QCLASS                    |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

QNAME : A.example.org

QTYPE : SRV (0x0021)

QCLASS : IN (0x0001)

TARGET

        Caching Server

SYNOPSIS

	SV_RFC2782_SRV_type.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

Network Topology

                                 . domain                 org domain               example.org domain
        AP Server1 (TN)          DNS Server2              DNS Server3              DNS Server4
          |A.example.org           |A.ROOT.NET              |NS3.example.org         |NS4.example.org
          |3ffe:501:ffff:101::10   |3ffe:501:ffff:101::20   |3ffe:501:ffff:101::30   |3ffe:501:ffff:101::40 
          |192.168.1.10            |192.168.1.20            |192.168.1.30            |192.168.1.40
          |                        |                        |                        |
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 root server list:

For IPv4:

.                       3600000         IN      NS      A.ROOT.NET.
A.ROOT.NET.             3600000                 A       192.168.1.20

For IPv6:

.                       3600000         IN      NS      A.ROOT.NET.
A.ROOT.NET.             3600000                 AAAA    3ffe:501:ffff:101::20

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
;

TEST PROCEDURE

        This test sequence is following.
                                                                        <--------- TN ------------>
    DNS Client1 (TN)             DNS Server1 (NUT)                  DNS Server2 DNS Server3 DNS Server4
        |                              |                                 |           |           |
        |----------------------------->|                                 |           |           |
        | 1. Send standard query       |                                 |           |           |
        |    QNAME=_http._tcp.example.org.                               |           |           |
        |    QTYPE=SRV                 |                                 |           |           |
        |                              |                                 |           |           |
        |                              |-------------------------------->|           |           |
        |                              | 2. Send standard query          |           |           |
        |                              |  QNAME=_http._tcp.example.org.  |           |           |
        |                              |  QTYPE=SRV                      |           |           |
        |                              |                                 |           |           |
        |                              |<--------------------------------|           |           |
        |                              | 3. Send standard response       |           |           |
        |                              |  QNAME=_http._tcp.example.org.  |           |           |
        |                              |  QTYPE=SRV                      |           |           |
        |                              |  AUTHORITY Name=org.            |           |           |
        |                              |  AUTHORITY Name Server          |           |           |
        |                              |            =NS3.example.org.    |           |           |
        |                              |  ADDITIONAL Name=NS3.example.org.           |           |
        |                              |  ADDITIONAL Address=192.168.1.30|           |           |
        |                              |                                 |           |           |
        |                              |                                 v           |           |
        |                              |                                             |           |
        |                              |-------------------------------------------->|           |
        |                              |             4. Send standard query          |           |
        |                              |              QNAME=_http._tcp.example.org.  |           |
        |                              |              QTYPE=SRV                      |           |
        |                              |                                             |           |
        |                              |<--------------------------------------------|           |
        |                              |             5. Send standard response       |           |
        |                              |              QNAME=_http._tcp.example.org.  |           |
        |                              |              QTYPE=SRV                      |           |
        |                              |              AUTHORITY Name=example.org.    |           |
        |                              |              AUTHORITY Name Server          |           |
        |                              |                     = NS4.example.org.      |           |
        |                              |              ADDITIONAL Name                |           |
        |                              |                     = NS4.example.org.      |           |
        |                              |              ADDITIONAL Address             |           |
        |                              |                     = 192.168.1.40          |           |
        |                              |                                             |           |
        |                              |                                             v           |
        |                              |                                                         |
        |                              |-------------------------------------------------------->|
        |                              |                          6. Send standard query         |
        |                              |                           QNAME=_http._tcp.example.org. |
        |                              |                           QTYPE=SRV                     |
        |                              |                                                         |
        |                              |<--------------------------------------------------------|
        |                              |                          7. Send standard response      |
        |                              |                           QNAME=_http._tcp.example.org. |
        |                              |                           QTYPE=SRV                     |
        |                              |                           ANSWER                        |
        |                              |                               Priority = 10             |
        |                              |                               Weight = 20               |
        |                              |                               Port = 80                 |
        |                              |                               Target = A.example.org.   |
        |                              |                           AUTHORITY Name=example.org.   |
        |                              |                           AUTHORITY Name Server         |
        |                              |                               = NS4.example.org.        |
        |                              |                           ADDITIONAL Name               |
        |                              |                               = A.example.org.          |
        |                              |                           ADDITIONAL Address            |
        |                              |                               = 192.168.1.10            |
        |                              |                           ADDITIONAL Name               |
        |                              |                               = NS4.example.org.        |
        |                              |                           ADDITIONAL Address            |
        |                              |                               = 192.168.1.40            |
        |<-----------------------------|                                                         |
        | 8. Standard query response   |                                                         v
        |  QNAME=_http._tcp.example.org.
        |  QTYPE=SRV                   |
        |  ANSWER                      |
        |      Priority = 10           |
        |      Weight = 20             |
        |      Port = 80               |
        |      Target = A.example.org. |
        |  AUTHORITY Name=example.org. |
        |  AUTHORITY Name Server       |
        |      = NS4.example.org.      |
        |  ADDITIONAL Name             |
        |      = A.example.org.        |
        |  ADDITIONAL Address          |
        |      = 192.168.1.10          |
        |  ADDITIONAL Name             |
        |      = NS4.example.org.      |
        |  ADDITIONAL Address          |
        |      = 192.168.1.40          |
        v                              v

        1. TN send standard query QNAME=_http._tcp.example.org., QTYPE=SRV to NUT.
        2. NUT transmits standard query to DNS Server2 (TN: root name server) (Judgment *2)
        3. TN send query response to NUT w/ AUTHORITY Name=org., AUTHORITY Name Server=NS3.example.org.
        4. NUT transmits standard query QNAME=_http._tcp.example.org., QTYPE=SRV DNS Server3 (TN: NS3.example.org.) (Judgment *4)
        5. TN send query response to NUT w/ AUTHORITY Name=example.org., AUTHORITY Name Server=NS4.example.org.
        6. NUT transmits standard query QNAME=_http._tcp.example.org., QTYPE=SRV DNS Server4 (TN: NS4.example.org.) (Judgment *6)
        7. TN send query response to ANSWER Target = A.example.org. to NUT.
        8. NUT transmits query response to DNS Client1 (TN) (Judgment *8)

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.org.
	QTYPE	SRV (0x0021)
	QCLASS	IN (0x0001)

2nd packet.

Standard query from DNS Server1 (NUT) to Server2 (TN)
IP Header	Source Address	NUT_NETZ
IP Header	Destination Address	SV2_NETY
UDP Header	Src Port	ANY
UDP Header	Dst Port	53
DNS Header	ID	ANY
	QR	0
	OPCODE	0
	AA	ANY
	TC	0
	RD	0
	RA	0
	Z	0
	AD	0
	CD	1
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	0
	ARCOUNT	ANY
DNS Question section	QNAME	_http._tcp.example.org.
	QTYPE	SRV (0x0021)
	QCLASS	IN (0x0001)

3rd packet.

Standard query response from DNS Server2 (TN) to Server1 (NUT)
IP Header	Source Address	SV2_NETY
IP Header	Destination Address	NUT_NETZ
UDP Header	Src Port	53
UDP Header	Dst Port	Value that NUT uses
DNS Header	ID	Value that NUT uses
	QR	1
	OPCODE	0
	AA	0
	TC	0
	RD	0
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	1
	ARCOUNT	1
DNS Question section	QNAME	_http._tcp.example.org.
	QTYPE	SRV (0x0021)
	QCLASS	IN (0x0001)
DNS Authority section	NAME	org. (Pointer 0xC01F)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	17
	NSDNAME	NS3.example.org.
DNS Additional section	NAME	NS3.example.org. (Pointer 0xC034)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.30

4th packet.

Standard query from DNS Server1 (NUT) to Server3 (TN)
IP Header	Source Address	NUT_NETZ
IP Header	Destination Address	SV3_NETY
UDP Header	Src Port	ANY
UDP Header	Dst Port	53
DNS Header	ID	ANY
	QR	0
	OPCODE	0
	AA	0
	TC	0
	RD	0
	RA	0
	Z	0
	AD	0
	CD	1
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	0
	ARCOUNT	ANY
DNS Question section	QNAME	_http._tcp.example.org.
	QTYPE	SRV (0x0021)
	QCLASS	IN (0x0001)

5th packet.

Standard query response from DNS Server3 (TN) to Server1 (NUT)
IP Header	Source Address	SV3_NETY
IP Header	Destination Address	NUT_NETZ
UDP Header	Src Port	Value that NUT uses
UDP Header	Dst Port	53
DNS Header	ID	Value that NUT uses
	QR	1
	OPCODE	0
	AA	0
	TC	0
	RD	0
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	1
	ARCOUNT	1
DNS Question section	QNAME	_http._tcp.example.org.
	QTYPE	SRV (0x0021)
	QCLASS	IN (0x0001)
DNS Authority section	NAME	example.org. (Pointer 0xC017)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	6
	NSDNAME	NS4.example.org.
DNS Additional section	NAME	NS4.example.org. (Pointer 0xC034)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.40

6th packet.

Standard query from DNS Server1 (NUT) to Server4 (TN)
IP Header	Source Address	NUT_NETZ
IP Header	Destination Address	SV4_NETY
UDP Header	Src Port	ANY
UDP Header	Dst Port	53
DNS Header	ID	ANY
	QR	0
	OPCODE	0
	AA	0
	TC	0
	RD	0
	RA	0
	Z	0
	AD	0
	CD	1
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	0
	ARCOUNT	ANY
DNS Question section	QNAME	_http._tcp.example.org.
	QTYPE	SRV (0x0021)
	QCLASS	IN (0x0001)

7th packet.

Standard query response from DNS Server4 (TN) to Server1 (NUT)
IP Header	Source Address	SV4_NETY
IP Header	Destination Address	NUT_NETZ
UDP Header	Src Port	Value that NUT uses
UDP Header	Dst Port	53
DNS Header	ID	Value that NUT uses
	QR	1
	OPCODE	0
	AA	1
	TC	0
	RD	0
	RA	1
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	NSCOUNT	1
	ARCOUNT	2
DNS Question section	QNAME	_http._tcp.example.org.
	QTYPE	SRV (0x0021)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	_http._tcp.example.org. (Pointer 0xC00C)
	TYPE	SRV (0x0021)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	21
	Priority	10
	Weight	20
	Port	80
	Target	A.example.org.
DNS Authority section	NAME	example.org. (Pointer 0xC03C)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	6
	NSDNAME	NS4.example.org. (NS4 + Pointer 0xC03C)
DNS Additional section	NAME	A.example.org. (Pointer 0xC03A)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.10
DNS Additional section	NAME	NS4.example.org (Pointer 0xC055)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.40

8th 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	0
	TC	0
	RD	1
	RA	1
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	NSCOUNT	1
	ARCOUNT	2
DNS Question section	QNAME	_http._tcp.example.org.
	QTYPE	SRV (0x0021)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	_http._tcp.example.org. (Pointer 0xC00C)
	TYPE	SRV (0x0021)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	21
	Priority	10
	Weight	20
	Port	80
	Target	A.example.org.
DNS Authority section	NAME	example.org (Pointer 0xC03C)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	6
	NSDNAME	NS4.example.org (NS4 + Pointer 0xC03C)
DNS Additional section	NAME	A.example.org. (Pointer 0xC03A)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.10
DNS Additional section	NAME	NS4.example.org (Pointer 0xC055)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.40

Exp.

NUT_NETZ	DNS Server1's (NUT) Net-z address
CL1_NETZ	DNS Client1's (TN) Net-z address
SV2_NETY	DNS Server2's (TN) Net-y address
SV3_NETY	DNS Server3's (TN) Net-y address
SV4_NETY	DNS Server4's (TN) Net-y address

JUDGMENT

        2. Received standard query including QNAME=_http._tcp.example.org., QTYPE=SRV.
        4. Received standard query including QNAME=_http._tcp.example.org., QTYPE=SRV.
        6. Received standard query including QNAME=_http._tcp.example.org., QTYPE=SRV.
        8. Received standard query response including correct domain name in the Target field.

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