NAME

        Dst_Unreach_4_Global.seq - check ICMPv6 Destination 
        Unreachable code 4

TARGET

        Host/Router

SYNOPSIS

        Dst_Unreach_4_Global.seq [-tooloption ...] -p 
        Dst_Unreach_4_Global.def

INITIALIZATION

        If the NUT is a host, send a Router Advertisment.
        If the NUT is a router, configure a default route with TN as the next hop.
        And make state of Neighbor Cashe Entry for TN's addresses reachable.

TEST PROCEDURE

        This test verifies that NUT sends valid ICMPv6 Destination 
        Unreachable (code 4) in response to a packet which can not 
        be delivered to destination port.
        And this test verifies that the message processing rule ,

        If the message is a response to a message sent to one of the
        node's unicast addresses, the Source Address of the reply must
        be that same address.

        TN                      NUT

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

        1.
         === UDP packet  ===>
                src address : TN global address
                dst address : NUT global address        
                    port    : not used in NUT
        2.
        << JUDGEMENT >>

         <=== ICMPv6 Destination Unreachable ===
                Code is 4

JUDGEMENT

        << PASS >>
                NUT send ICMPv6 Destination Unreachable.

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

REFERENCE

RFC 2463 - ICMPv6 (ICMP for IPv6)