NAME

        ingress_filter.seq - Verify that the tunnel source address is 
        acceptable or not

TARGET

        Router

INITIALIZATION

	Before this test starts, run initialize.seq.

TEST PROCEDURE

        This test verifies that the tunnel source address is acceptable 
        before forwarding decapsulated packets
        
        Network Topology

        Link0   
        --------------------------
            |               |
           TN              NUT
            |               |   
        --------------------------
        Link1

        
        TN -- (Link0) -- NUT            TN -- (Link1) -- NUT

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

        1.
                                    ===================>
        IPv4 packet encapsulating IPv6 packet
                Outer Header (IPv4)     
                        src address : Off-link IPv4 address
                        dst address : NUT Link1 IPv4 address        
                Inner Header (IPv6)     
                        src address : Off-link IPv6 global address
                        dst address : TN LINK0 IPv6 global address        

        2.
        In NUT, received IPv4 packet is decapsulated, and forward 
        ICMPv6 Echo Request packet or not.   
        3.
        << JUDGMENT >>
        
        NUT did not send ICMPv6 Echo Request
                        or
        <===================
        ICMPv6 Echo Request
                IPv6 Header
                        src address : Off-link IPv6 global address
                        dst address : TN LINK0  IPv6 global address        

JUDGMENT

        << PASS >>

                NUT did not received ICMPv6 Echo Request

        << FAIL >>      

                NUT received ICMPv6 Echo Request

SEE ALSO

          perldoc V6evalTool