NAME

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

TARGET

        Router

SYNOPSIS

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

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