NAME

        SV_RFC2181_9_TC_not_set - Case of the TC header bit is not set

VERIFICATION POINTS

        Verify that a NUT does not set TC bit for results of additional section processing.

The TC bit should not be set merely because some extra information could have been included, but there was insufficient room. This includes the results of additional section processing. In such cases the entire RRSet that will not fit in the response should be omitted, and the reply sent as is, with the TC bit clear.

TARGET

        Authoritative Server

SYNOPSIS

	SV_RFC2181_9_TC_not_set.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.

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	A	192.168.1.10
B	IN	A	192.168.1.100
	IN	A	192.168.1.101
	IN	A	192.168.1.102
	IN	A	192.168.1.103
	IN	A	192.168.1.104
	IN	A	192.168.1.105
	IN	A	192.168.1.106
	IN	A	192.168.1.107
	IN	A	192.168.1.108
	IN	A	192.168.1.109
	IN	A	192.168.1.110
	IN	A	192.168.1.111
	IN	A	192.168.1.112
	IN	A	192.168.1.113
	IN	A	192.168.1.114
	IN	A	192.168.1.115
	IN	A	192.168.1.116
	IN	A	192.168.1.117
	IN	A	192.168.1.118
	IN	A	192.168.1.119
	IN	A	192.168.1.120
	IN	A	192.168.1.121
	IN	A	192.168.1.122
	IN	A	192.168.1.123
	IN	A	192.168.1.124
	IN	A	192.168.1.125
	IN	A	192.168.1.126
	IN	A	192.168.1.127

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (TN)                       DNS Server1 (NUT)
        |                                      |
        |------------------------------------->|
        |   1. Send standard query             |
        |       QNAME=B.example.com            |
        |       QTYPE=A                        |
        |                                      |
        |<-------------------------------------|
        |   2. Standard query response         |
        |       (TC bit is not set)            |
        |       QNAME=B.example.com            |
        |       QTYPE=A                        |
        |       Answer=192.168.1.100           |
        |          to  192.168.1.127           |
        |       AUTHORITY Name=example.org     |
        |       AUTHORITY Name Server          |
        |           = NS1.example.org          |
        |                                      |
        v                                      v

        1. TN send standard query QNAME=B.example.com, QTYPE=A to NUT.
        2. NUT reply query response w/ A=192.168.1.100 - 192.168.1.127 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	B.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	2000
DNS Header	ID	0x1000
	QR	1
	OPCODE	0
	AA	1
	TC	0
	RD	1
	RA	ANY
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	30
	NSCOUNT	0
	ARCOUNT	0
DNS Question section	QNAME	B.example.com
	QTYPE	A (0x0001)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	B.example.com (Pointer 0xC00C)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.100
DNS Answer section X 28 ADDRESS 192.168.1.101 - 192.168.1.126	NAME	B.example.com (Pointer 0xC00C)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	****
DNS Answer section	NAME	B.example.com (Pointer 0xC00C)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	1 day (86400)
	RDLENGTH	4
	ADDRESS	192.168.1.127
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)

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 w/ A=192.168.1.100 - 192.168.1.127 that include Authority section (TC bit is not set).

TERMINATION

        None

REFERENCE

        RFC2181 Clarifications to the DNS Specification
        9. The TC (truncated) header bit