NAME

        To_Multi_Pkt_Too_Big - Verify that the NUT sends Packet Too Big Message

TARGET

        Router

SYNOPSIS

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

NETWORK CONFIGURATION

        This test is OFFLINK Network Configuration test.
        In this test, TN play a Roll of the Router.
        
        Physical Network configuration
        
        Link0   
        --------+---------------+--------------
                |               |
                NUT             TN
                |               |
        --------+---------------+--------------
        Link1

        Logical Network Configuration

                        Host A (TN-Link0)
                        |                                       Link0
        --------+-------+-----------------
                | 
                NUT (globaladdress:B)
                |
        --------+-------+-----------------
                        |                                       Link1
                        Router(TN-Link1)
                        |
        ----------------+-------+---------
                                |
                                HOST B (OFFLINK_LINK1_GLOBAL_ADDRESS)

        In this configuration, Packets are send and received.

        for example,
                In Logical
                        HOST B           -- Echo Reply --> NUT
                Actually, in physical
                        TN (as Router)   -- Echo Reply --> NUT

INITIALIZATION

        Status of Neighbor Cache Entry for TN's addresses are reachable.

TEST PROCEDURE

        This test verifies that the node sends a Packet Too Big Message 
        in response to a packet that it can not forward because the packet 
        is larger than the MTU of the outgoing link.

        TN                      NUT

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

        1.
        After NUT is initialized (set static route) , NUT sets 
        the Link MTU of LINK1 Interface to 1280 .

        2.
        TN send Echo Request to Host B.

         === echo request  ===>
                src address : TN global address
                dst address : global multicast address(ff1e::1:2)
                PayloadLength : 1460

        3.
        NUT send Packet Too Big Message

         <=== Packet Too Big Message ===

JUDGEMENT

        
        << PASS >>
                NUT send a Packet Too Big Message.

        << FAIL >>      
                NUT do not send a Packet Too Big Message.

REFERENCE

RFC 2463 - ICMPv6 (ICMP for IPv6)