NAME

        To_Multi_Dst_Unreach_4.seq - check Message Processing Rules (ICMPv6
         Destination Unreachable )

TARGET

        Host/Router

SYNOPSIS

        To_Multi_Dst_Unreach_4.seq [-tooloption ...] -p To_Multi_Dst_Unreach_4.def

INITIALIZATION

        When test starts, states of Neighbor Cache Entry for TN's 
        addresses are reachable.

TEST PROCEDURE

        This test verifies that the message processing rule,
        
        An ICMPv6 error message MUST NOT be sent as a result of
        receiving:

        a packet destined to an IPv6 multicast address (there are
        two exceptions to this rule: (1) the Packet Too Big
        Message - Section 3.2 - to allow Path MTU discovery to
        work for IPv6 multicast, and (2) the Parameter Problem
        Message, Code 2 - Section 3.4 - reporting an unrecognized
        IPv6 option that has the Option Type highest-order two
        bits set to 10).

        TN                      NUT

        ---------------------------

        1.
         === UDP packet  ===>
                src address : TN link local address
                dst address : all node multicast address
             port number is not used in NUT
        2.
        << JUDGMENT >>

         <=== No pakcet ===
                        or
         <=== ICMPv6 Destination Unreachable ===
             Code is 4

JUDGMENT

        << PASS >>
                NUT do not send ICMPv6 Destination Unreachable.
                
        << FAIL >>      
                NUT send ICMPv6 Destination Unreachable.

REFERENCE

RFC2463 2.4 Message Processing Rules

   Implementations MUST observe the following rules when processing
   ICMPv6 messages (from [RFC-1122]):

    (e) An ICMPv6 error message MUST NOT be sent as a result of
        receiving:

         (e.1) an ICMPv6 error message, or

         (e.2) a packet destined to an IPv6 multicast address (there are
               two exceptions to this rule: (1) the Packet Too Big
               Message - Section 3.2 - to allow Path MTU discovery to
               work for IPv6 multicast, and (2) the Parameter Problem
               Message, Code 2 - Section 3.4 - reporting an unrecognized
               IPv6 option that has the Option Type highest-order two
               bits set to 10), or

         (e.3) a packet sent as a link-layer multicast, (the exception
               from e.2 applies to this case too), or

         (e.4) a packet sent as a link-layer broadcast, (the exception
               from e.2 applies to this case too), or

         (e.5) a packet whose source address does not uniquely identify
               a single node -- e.g., the IPv6 Unspecified Address, an
               IPv6 multicast address, or an address known by the ICMP
               message sender to be an IPv6 anycast address.