NAME

        rfc2765_4.2_icmpv6query.seq - Verify IPv6 <-> IPv4 header 
        translation in accordance with RFC2765 [SIIT]

TARGET

        Router

SYNOPSIS

        rfc2765_4.2_icmpv6query.seq [-tooloption ...] 
        -p rfc2765_4.2_icmpv6query.def

INITIALIZATION

	Before this test starts, run initialize.seq.

TEST PROCEDURE

        This test verifies that NUT can translates ICMPv6 query messages
        in accordance to RFC2765.
        
        Network Topology

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

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

        1.1.[1-2]
        ===================>
        ICMPv6 packet
                IPv6 Header
                        src address : TN LINK0 IPv4 embedded IPv6 address
                        dst address : TN LINK1 IPv4 embedded IPv6 address
                ICMPv6 Echo Request/Reply (Type 128 and Type 129)

        1.2.[1-2]
        <<JUDGMENT>>
                                   ===================>
        ICMPv4 packet
                IPv4 Header
                        src address : TN LINK0 IPv4 address
                        dst address : TN LINK1 IPv4 address
                        DF = 1
                ICMPv4 Echo Request/Reply (Type 8 and Type 0)

        2.1.[1-3]
        ===================>
        ICMPv6 packet
                IPv6 Header
                        src address : TN LINK0 IPv4 embedded IPv6 address
                        dst address : TN LINK1 IPv4 embedded IPv6 address
                MLD Multicast Listener Query/Report/Done (Type 130, 131, 132)

        2.2.[1-3]
        <<JUDGMENT>>
                Packet is silently dropped

        3.1.[1-5]
        ===================>
        ICMPv6 packet
                IPv6 Header
                        src address : TN LINK0 IPv4 embedded IPv6 address
                        dst address : TN LINK1 IPv4 embedded IPv6 address
                Neighbor Discover messages (Type 133 through 137)

        3.2.[1-5]
        <<JUDGMENT>>
                Packet is silently dropped

        4.1
        ===================>
        ICMPv6 packet
                IPv6 Header
                        src address : TN LINK0 IPv4 embedded IPv6 address
                        dst address : TN LINK1 IPv4 embedded IPv6 address
                Unknown informational messages (Type 255)

        4.2
        <<JUDGMENT>>
                Packet is silently dropped

JUDGMENT

        << PASS >>
                NUT translates ICMPv6 echo request/reply to ICMPv4 echo 
                request/reply and silently drops other ICMPv6 query types.
                
        << FAIL >>      
                NUT fails to translate ICMPv6 echo request/reply, or doesn't
                drop other ICMPv6 query types.

NOTE

REFERENCE

RFC2765

4.2. Translating ICMPv6 Headers into ICMPv4 Headers

   All ICMP messages that are to be translated require that the ICMP
   checksum field be updated as part of the translation since ICMPv6,
   unlike ICMPv4, has a pseudo-header checksum just like UDP and TCP.

   In addition all ICMP packets need to have the Type value translated
   and for ICMP error messages the included IP header also needs
   translation.

   The actions needed to translate various ICMPv6 messages are:

      ICMPv6 informational messages:

        Echo Request and Echo Reply (Type 128 and 129)
           Adjust the type to 0 and 8, respectively, and adjust the ICMP
           checksum both to take the type change into account and to
           exclude the ICMPv6 pseudo-header.

        MLD Multicast Listener Query/Report/Done (Type 130, 131, 132)
           Single hop message.  Silently drop.

        Neighbor Discover messages (Type 133 through 137)
           Single hop message.  Silently drop.

        Unknown informational messages
           Silently drop.