NAME

        Pkt_Too_Big - Verify that the NUT sends Packet Too Big Message


TARGET

        Router


SYNOPSIS

        Pkt_Too_Big.seq [-tooloption ...] -p 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

        TN attempt to execute remote command 'vRemote(route.rmt)'.
        'route add -inet6 OFFLINK_LINK1_GLOBAL_ADDRESS TN-LINK1-address' 

        And 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 1300 .

        2.
        TN send Echo Request to Host B.

         === echo request  ===>

        3.
        NUT send Packet Too Big Message 

         <=== Packet Too Big Message ===


JUDGMENT

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

        << FAIL >>      
                NUT do not send a Packet Too Big Message.
                
=head1 SEE ALSO

          perldoc V6evalTool
          perldoc V6evalRemote