# 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