NAME

        SV_RFC1034_4_3_1_Recursive - Recursion Available (RA) bit is set or cleared by a name server in all responses

VERIFICATION POINTS

        Verify that whether NUT can set or clear RA bit in all responses.

                                    1  1  1  1  1  1
      0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                      ID                       |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |QR|   Opcode  |AA|TC|RD|RA|   Z    |   RCODE   |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    QDCOUNT                    |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    ANCOUNT                    |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    NSCOUNT                    |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    ARCOUNT                    |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

TARGET

        Server

SYNOPSIS

	SV_RFC1034_4_3_1_Recursive.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

Network Topology

        AP Server1 (TN)
          |A.example.org
          |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.

Configure the Server1's (NUT) zone file to response query from TN.

At first enable non-recursive mode.

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
;
A	IN	A	192.168.1.10

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (TN)             DNS Server1 (NUT)
        |                              |
        |----------------------------->|
        | 1. Send standard query       |
        |    RD = 1                    |
        |    RA = 1                    |
        |    QNAME=A.example.com       |
        |    QTYPE=A                   |
        |                              |
        |<-----------------------------|
        | 2. Standard query response   |
        |    RD = 1                    |
        |    RA = 0                    |
        |  QNAME = A.example.com       |
        |  QTYPE = A                   |
        |  ANSWER Name                 |
        |           = A.example.com    |
        |  ANSWER Address              |
        |           = 192.168.1.10     |
        |  AUTHORITY Name              |
        |           = example.com      |
        |  AUTHORITY Name Server       |
        |           = NS1.example.com  |
        |  ADDITIONAL Name             |
        |           = NS1.example.com  |
        |  ADDITIONAL Address          |
        |           = 192.168.0.10     |
        |                              |
        |                              |
        v                              v

        3. Disable non-recursive mode on DNS Server1 (NUT)

        |                              |
        |                              |
        |----------------------------->|
        | 4. Send standard query       |
        |    RD = 1                    |
        |    RA = 0                    |
        |  QNAME = A.example.com       |
        |  QTYPE = A                   |
        |                              |
        |<-----------------------------|
        | 5. Standard query response   |
        |    RD = 1                    |
        |    RA = 1                    |
        |  QNAME = A.example.com       |
        |  QTYPE = A                   |
        |  ANSWER Name                 |
        |           = A.example.com    |
        |  ANSWER Address              |
        |           = 192.168.1.10     |
        |  AUTHORITY Name              |
        |           = example.com      |
        |  AUTHORITY Name Server       |
        |           = NS1.example.com  |
        |  ADDITIONAL Name             |
        |           = NS1.example.com  |
        |  ADDITIONAL Address          |
        |           = 192.168.0.10     |
        |                              |
        v                              v

        This test sequence is following.

        1. DNS Client1 (TN) send standard query QNAME=A.example.com, QTYPE=A with RD=1, RA=1 to DNS Server1 (NUT).
        2. DNS Server1 (NUT) transmits standard query response from which RA bit is cleared to DNS Client1 (TN). (Judgment *2)
        3. Disable non-recursive mode on DNS Server1 (NUT) and restart DNS service.
        4. DNS Client1 (TN) send standard query QNAME=A.example.org, QTYPE=A with RD=1, RA=0 to DNS Server1 (NUT).
        5. DNS Server1 (NUT) transmits standard query response from which RA bit is set to DNS Client1 (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	1000
UDP Header	Dst Port	53
DNS Header	ID	0x1000
	QR	0
	OPCODE	0
	AA	0
	TC	0
	RD	1
	RA	1
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	0
	ARCOUNT	0
DNS Question section	QNAME	A.example.com
	QTYPE	A (0x0001)
	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	1000
DNS Header	ID	0x1000
	QR	1
	OPCODE	0
	AA	1
	TC	0
	RD	1
	RA	0
	Z	ANY
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	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 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 0xC03B)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.0.10

3rd packet.

Nothing.

4th 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	1000
UDP Header	Dst Port	53
DNS Header	ID	0x2000
	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	A.example.com
	QTYPE	A (0x0001)
	QCLASS	IN (0x0001)

5th 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	1000
DNS Header	ID	0x2000
	QR	1
	OPCODE	0
	AA	1
	TC	0
	RD	1
	RA	1
	Z	ANY
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	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 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 0xC03B)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.0.10

JUDGMENT

        2. Received standard query response from which RA bit is cleared.
        5. Received standard query response from which RA bit is set.

TERMINATION

        None

REFERENCE

        RFC1034 DOMAIN NAMES - CONCEPTS AND FACILITIES
        4. NAME SERVERS
        4.3.1. Queries and responses