NAME

        pmtuStore - Verify if NUT can store PMTU for multiple Destinations.

TARGET

        Host

SYNOPSIS

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

NETWORK CONFIGURATION

        This test evaluate the behavior of NUT when it receive the ICMP
        Packet Too Big Message for multiple destinations.
        In this test, NUT is a host and TN plays a Roll of Routers and 
        other hosts.
        
        Phisical Network configuration
        
        --------+---------------+----------
                |               |
                NUT             TN

        Logical Network Configuration

                                NUT
                                |
        ----------------+-------+--------
                        |
                        Router-1
                        |
        --------+-------+-------+--------
                |               | 
             Router-2         HOST-1
                |
        --------+-------+-------+--------
                        |       |
                     Router-n  HOST-2
                        |
        ----------------+-------+--------
                                | 
                              HOST-n
                                : 
                                :

        In this test, NUT receives Packet Too Big Messages for multiple
        destinations. 
        - Register PMTU for multiple HOST
        - Verify PMTU for multiple HOST

INITIALIZATION

        The TN send a RA to assign global address prefix.

           TN          NUT
           |            |
        ---+------------+------

        ===multicast RA===>
        src=TN's link-local
        dst=LinkLocal-all-node                                                  
        M=0, O=0,
        Lifetime=3600, ReachableTime=60000, RetransTimer=1005
        Prefix:
           L=1, A=1,                       
           ValidLifetime=3600005, PreferredLifetime=3600005
           Prefix=3ffe:501:ffff:100::, PrefixLength=64                      
   
          Wait (5 sec.)
                 Ignoring DAD packets for global address.

TEST PROCEDURE

        "pmtuStore" verify NUT's behavior when it receives 
         ICMP Packet Too Big Mesg for multiple destinations.

           TN          NUT
           |            |
        ---+------------+------

        1. Register PMTU for multiple destinations
        1.1
        TN send Echo Request.
        TN(n) === echo request(1500) ===> NUT

        1.2
        NUT send Echo Reply.

        TN(n) <=== echo reply(1500) === NUT

        1.3
        TN send ICMPv6 Too Big Mesg with MTU (1280+n*8).
        
        TN(n) === ICMPv6 Too Big Mesg(MTU=1280+n*8) ===> NUT

        2. Confirm PMTU for multiple destinations
        2.1
        TN send Echo Request.
        TN(n) === echo request(1500) ===> NUT

        2.2
        NUT send Echo Reply 
        << JUDGMENT 1 >>
        TN(n) <=== echo reply(1280+n*8 1/2) === NUT
        TN(n) <=== echo reply( 276-n*8 2/2) === NUT

JUDGMENT

        << JUDGMENT 1 -PASS- >>
                NUT send Echo Reply

                "PASS" means that NUT set valid MTU in received Packet Too Big message for multiple destinations.
                And fragmented packets are correct.