NAME

        SV_RFC1123_6_1_3_2_Multicast_ignore - Server ignores queries via broadcast or multicast address

VERIFICATION POINTS

        Verify that a NUT ignores queries with RD=1.

• A server MAY support a UDP query that is delivered using an IP broadcast or multicast address. However, the Recursion Desired bit MUST NOT be set in a query that is multicast, and MUST be ignored by name servers receiving queries via a broadcast or multicast address. A host that sends broadcast or multicast DNS queries SHOULD send them only as occasional probes, caching the IP address(es) it obtains from the response(s) so it can normally send unicast queries.

TARGET

        Caching Server

SYNOPSIS

	SV_RFC1123_6_1_3_2_Multicast_ignore.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

Network Topology

                                 . domain
        AP Server1 (TN)          DNS Server2
          |A.example.org           |A.ROOT.NET
          |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 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.

    DNS Client1 (TN)             DNS Server1 (NUT)                  DNS Server2 (TN)
        |                              |                                 |
        |----------------------------->|                                 |
        | 1. Send standard query       |                                 |
        |  *broadcast or multicast     |                                 |
        |  RD=1                        |                                 |
        |  QNAME=A.example.org         |                                 |
        |  QTYPE=A                     |                                 |
        |                              |                                 |
        |                              |-----------------------------> X |
        |                              | 2. Recv standard query          |
        |                              |  QNAME=A.example.org            |
        |                              |  QTYPE=A                        |
        |                              |                                 |
        v                              v                                 v

        1. TN send standard query QNAME=A.example.org, QTYPE=A to NUT.
        2. NUT transmits standard query to DNS Server2 (TN: root name server) (Judgment *2)

Packet Description



1st packet.

Standard query from DNS Client1 (TN) to Server1 (NUT)
IP Header	Source Address	CL1_NETZ
	Destination Address	BRO_MULTI
UDP Header	Src Port	2000
	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	A.example.org
	QTYPE	A (0x0001)
	QCLASS	IN (0x0001)




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
BRO_MULTI	broadcast(for IPv4) or multicast(for IPv6) address

JUDGMENT

        2. Not received standard query to DNS Server2 (TN).

TERMINATION

        None

REFERENCE

        RFC1123 Requirements for internet Hosts -- Application and Support
        6.1.3.2 Transport Protocols