NAME

  RAwithMTUreduce - Router Advertisement with MTU Option (Hosts Only)

TARGET

  Host

SYNOPSIS

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

INITIALIZATION

        Common Test Setup 1.1

TEST PROCEDURE

Verify that a host properly processes a Router Advertisement with an MTU option.

   TN2                    TR1                    NUT
    |                      |                      |
    |-------------------------------------------->|
    |   1.Echo Request     |                      |
    |   (1500 octets)      |                      |
    |                      |                      |
    |<--------------------------------------------|
    |   2.Echo Reply       |                      |
    |   (1500 octets)      |                      |
    |                      |                      |
    |                      +--------------------->|
    |                      |3.Router Advertisemnt |
    |                      |  (MTU 1280)          |
    |                      |                      |
    |-------------------------------------------->|
    | 4.Fragmented Echo    |                      |
    |   Request            |                      |
    |   (1st + 2nd = 1500) |                      |
    |<--------------------------------------------|
    | 5.Fragment Echo Reply|                      |
    |   (1st +2nd = 1500)  |                      |
    |                      |                      |
    v                      v                      v

  1. Send Echo Request (Paket size is 1500)
  2. Receive Echo Reply (Paket size is 1500) <<Check 1>>
  3. Send Router Advertisement (MTU is 1280)
  4. Send fragmented Echo Request (1st + 2nd fragment = 1500 octets)
  5. Receive fragmented Echo Reply (1st + 2nd fragment = 1500 octets) <<Check 2>>

  Echo Request Data is:

        IPv6 Header
            Version            = 6
            Traffic Class      = 0
            FlowLabel          = 0
            PayloadLength      = 1460
            NextHeader         = 58 (ICMPv6)
            SourceAddress      = TN2's Global Address
            DestinationAddress = NUT's Global Address

        ICMP Echo Request
            Type           = 128 (Echo Request)
            Code           = 0
            Checksum       = (auto)
            Identifier     = 0xffff
            SequenceNumber = 1
            PayloadData    = (1452 octets)

  Router Advertisement is:

        IPv6 Header
            Version            = 6
            Traffic Class      = 0
            FlowLabel          = 0
            PayloadLength      = 24
            NextHeader         = 58 (ICMPv6)
            SourceAddress      = TR1's Global Address
            DestinationAddress = NUT's Global Address

        ICMP Router Advertisement
            Type           = 134 (Router Advertisement)
            Code           = 0
            Checksum       = (auto)
            CurHopLimit    = 0
            MFlag          = 0
            OFlag          = 0
            HFlag          = 0
            Preference     = 0
            Reserved       = 0
            LifeTime       = 20
            ReachableTime  = 10000
            RetransTimer   = 1000

        Option ICMP MTU
            Type           = 5 (Router Advertisement)
            Length         = 1
            Reserved       = 0
            MTU            = 1280

JUDGEMENT

  PASS: <<Check 1>> Echo Reply Received or Fragment Echo Reply Received
        <<Check 2>> Fragment Echo Reply Received. 1st and 2nd fragment no larger than 1280 octets.

        IPv6 Header
            Version             = 6
            Traffic Class       = 0
            FlowLabel           = 0
            PayloadLength       = 1460
            NextHeader          = 58 (ICMPv6)
            SourceAddress       = NUT's Global Address
            Destination Address = TN2's Global Address

        ICMP Echo Reply
            Type           = 129 (Echo Reply)
            Code           = 0
            Checksum       = (auto)
            Identifier     = 0xffff (same as Echo Request)
            SequenceNumber = 1 (same as Echo Request)
            PayloadData    = (1452 octets) (same as Echo Request)

CLEANUP

Common Test Cleanup

REFERENCE

RFC 8201 - Path MTU Discovery for IPv6