NAME

  IH_UnrecognizedNextHeader - check Unrecognized Next Header in IPv6 Header

TARGET

  Host and Router

SYNOPSIS

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

INITIALIZATION

  None

TEST PROCEDURE

  Tester                      Target
    |                           |
    |-------------------------->|
    |   Test Packet             |
    |                           |
    |                           |
    |<--------------------------|
    |   Neighbor Solicitation   |
    |                           |
    |                           |
    |-------------------------->|
    |   Neighbor Advertisement  |
    |                           |
    |                           |
    |<--------------------------|
    |   ICMP Error              |
    |                           |
    v                           v

  1. Send Test Packet (Unrecognized Next Header in IPv6 Header)
  2. Wait ICMP Error or NS
  3. If NS received then send NA, and wait ICMP Error again
  4. Receive ICMP Error

  Test Packet to Target Data is:

        IPv6 Header
            Version            = 6
            Traffic Class      = 0
            FlowLabel          = 0
            PayloadLength      = 10
            NextHeader         = 128 (Unrecognized value)
            SourceAddress      = Tester Address
            DestinationAddress = Tester Address

JUDGMENT

  PASS: ICMP Error Received

        IPv6 Header
            Version            = 6
            Traffic Class      = 0
            FlowLabel          = 0
            PayloadLength      = 58
            NextHeader         = 58 (ICMP)
            SourceAddress      = Target Address
            DestinationAddress = Tester Address

        ICMP Error
            Type           = 4 (Parameter Problem)
            Code           = 1 (unrecognized Next Header type encountered)
            Checksum       = (auto)
            Pointer        = 6 (Offset to Next Header type)
            PayloadData    = (Sent Packet)

REFERENCE

RFC2460

4. IPv6 Extension Headers

   If, as a result of processing a header, a node is required to proceed
   to the next header but the Next Header value in the current header is
   unrecognized by the node, it should discard the packet and send an
   ICMP Parameter Problem message to the source of the packet, with an
   ICMP Code value of 1 ("unrecognized Next Header type encountered")
   and the ICMP Pointer field containing the offset of the unrecognized
   value within the original packet.  The same action should be taken if
   a node encounters a Next Header value of zero in any header other
   than an IPv6 header.