NAME

        CL_RFC2671_4_5_OPT_UDP_size - Check Sender's UDP payload size

VERIFICATION POINTS

        Verify that a NUT transmits correct UDP payload size

The sender's UDP payload size (which OPT stores in the RR CLASS field)
is the number of octets of the largest UDP payload that can be reassembled
and delivered in the sender's network stack.

TARGET

        Client

SYNOPSIS

	CL_RFC2671_4_5_OPT_UDP_size.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

• Network Topology

        AP Server1(TN):A.example.com     DNS Server1(TN)
          |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
                   |
                   |
                 ROUTER1(TN)
                   |3ffe:501:ffff:100::1
                   |192.168.0.1
                   |
Net-z   --+--------+-------------------------------- 3ffe:501:ffff:100::/64 
          |                                          192.168.0/24
        DNS Client1(NUT)
           3ffe:501:ffff:100:XXXX
           192.168.0.10
	

	XXXX: EUI64 address
	

• Setup

	Set the DNS Server1(TN)'s address on NUT as above mentioned Network Topology.
	

• Pre-Sequence

	In order to send the query for A type of AP Server1(TN):A.example.com 
	to the DNS Server1(TN) with OPT RR(1024 bytes), NUT is configured.
	

TEST PROCEDURE

	This test sequence is following.


    DNS Client1 (NUT)                        DNS Server1 (TN)
        |                                              |
        |--------------------------------------------->|
        |           1. Send standard query             |
        |                                              |
        v                                              v


	1. NUT send standard query with OPT RR to TN.
                  Judgment (Check *1)

Packet Description
	

	  

	    

	      

	      1. Standard query from DNS Client1 (NUT) to DNS Server1 (TN) 
	      
	    
	    

	      
IP Header
	      
Source Address
	      
NUT_NETZ
	    
	    

	      
Destination Address
	      
SV_NETY
	    
	    

	      
UDP Header
	      
Src Port
	      
any
	    
	    

	      
Dst Port
	      
53
	    
 	   

 	     
DNS Header
 	     
ID
	      
any
	    
	    

	      
QR
	      
0
	    
	    

	      
OPCODE
	      
0
	    
	    

	      
AA
	      
any
	    
	    

	      
TC
	      
0
	    
	    

	      
RD
	      
any
	    
	    

	      
RA
	      
any
	    
	    

	      
Z
	      
any
	    
	    

	      
RCODE
 	     
any
	    
	    

	      
QDCOUNT
	      
1
 	   
	    

	      
ANCOUNT
	      
1
	    
	    

	      
NSCOUNT
	      
0
	    
	    

	      
ARCOUNT
	      
any
	    
	    

	      
DNS Question section
	      
QNAME
	      
A.example.com
	    
	    

	      
QTYPE
	      
A (0x0001)
	    
	    

	      
QCLASS
	      
any
	    
		

			
DNS Additional section
			
NAME(root)
			
empty (root domain 0x00)
		
		

			
TYPE(OPT)
			
EDNS0 option(0x0029)
		
		

			
CLASS(UDP payload size)
			
0x0400
		
		

			
TTL(EXTENDED-RCODE)
			
0x00
		
		

			
TTL(VERSION)
			
0x00
		
		

			
TTL(Z)
			
0x0000
		
		

			
RDLENGTH (describes RDATA)
			
0x0
		
		

			
RDATA {attribute,value} pairs
			
empty
		
	  
	
NUT_NETZ : DNS Client1(NUT)'s address
SV_NETY : DNS Server1(TN)'s address

JUDGMENT

        1. Standard query for A type with OPT RR must be based on above Verification Points.
                *CLASS(UDP payload size) field must have 0x400.

TERMINATION

        If NUT has cache function, clear the cache.

REFERENCE

	RFC2671 Extension Mechanisms for DNS (EDNS0)
	4 - OPT pseudo-RR