NAME

  HHO_MSB00_IN - Options Processing, Hop-by-Hop Options Header - Intermediate Node (Most Significant Bits 00)

TARGET

  Router

SYNOPSIS

  HHO_MSB00_IN.seq [-tooloption ...] -pkt HHO_MSB00_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        |                           |
    |                           |                           |
    |                           |                           |
    |                           |-------------------------->|
    |                           |        Echo Request       |
    |                           |                           |
    v                           v                           v

  1. TN1 transmits an Echo Request to TN2 with a first hop through the RUT,
     the Echo Request that has a Hop-by-Hop Options header with an unknown Option Type of 17.
  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 Global Address (Link1)

        Hop-by-Hop Options Header
            NextHeader         = 58 (ICMPv6)
            HeaderExtLength    = 0
            OptionType         = 0x11 (Unrecognized Option, Type 00)
            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 unknown option is skipped and the header is processed.
        The RUT must forward the Echo Request to TN2.

CLEANUP

Common Test Cleanup

REFERENCE

RFC 8200 - IPv6 Specification