NAME

  HHO_MSB10mc_IN - Options Processing, Hop-by-Hop Options Header - Intermediate Node (Most Significant Bits 10, multicast destination)

TARGET

  Router

SYNOPSIS

  HHO_MSB10mc_IN.seq [-tooloption ...] -pkt HHO_MSB10mc_IN.def
    -tooloption : v6eval tool option

INITIALIZATION

  None

TEST PROCEDURE

Verify that a router properly processes both know and unknown options, and acts in accordance with the highest order two bits of the option.

   TN1                         RUT                         TN2
              (Link0)                     (Link1)
    |                           |                           |
    |-------------------------->|                           |
    |   Echo Request            |                           |
    |                           |                           |
    |                           |                           |
    |                           |      (not forwarded)      |
    |                           |                           |
    |<--------------------------|                           |
    |   ICMP Error              |                           |
    |                           |                           |
    |                           |                           |
    v                           v                           v

  1. TN1 transmits an Echo Request to the global scope multicast destination 
     to Link0 with a first hop through the RUT,
     the Echo Request that has a Hop-by-Hop Options header with an unknown Option Type of 135.
  2. Observe the packets transmitted by the RUT.

  Echo Request Data is:

        IPv6 Header
            Version            = 6
            Traffic Class      = 0
            FlowLabel          = 0
            PayloadLength      = 16
            NextHeader         = 0 (Hop-by-Hop Options Header)
            SourceAddress      = TN1 Global Address (Link0)
            DestinationAddress = TN2 flobal scope Multicast Address (Link1)

        Hop-by-Hop Options Header
            NextHeader         = 58 (ICMPv6)
            HeaderExtLength    = 0
            OptionType         = 0x87 (Unrecognized Option, Type 10)
            OptDataLength      = 4
            data               = {0, 0, 0, 0}

        ICMP Echo Request
            Type           = 128 (Echo Request)
            Code           = 0
            Checksum       = (auto)
            Identifier     = 0xffff
            SequenceNumber = 1
            PayloadData    = {1, 2, 3, 4, 5, 6, 7, 8}

JUDGEMENT

  PASS: The RUT must send an ICMPv6 Parameter Problem message to TN1.
        The Code field must be 2 (unrecognized IPv6 option encountered).
        The Pointer field must be 0x2A (offset of the option field of Hop-by-Hop Options header.)
        The RUT must discard the Echo Request and not forward it to Link1.
             The Destination Address should be the same as 
             the Source Address in TN1's Echo Request Packet.

        IPv6 Header
            Version             = 6
            Traffic Class       = 0
            FlowLabel           = 0
            PayloadLength       = 16
            NextHeader          = 58 (ICMPv6)
            SourceAddress       = RUT Global Address (Link0)
            Destination Address = TN1 Global Address (Link0)

        ICMP Error
            Type           = 4 (Parameter Problem)
            Code           = 2 (unrecognized IPv6 option encountered)
            Checksum       = (auto)
            Pointer        = 42 (Offset to Option field of HbH Options Header)
            PayloadData    = (Sent Packet)

CLEANUP

Common Test Cleanup

REFERENCE

RFC 8200 - IPv6 Specification