# 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