F_TX_intime - Reassembly Time Exceeded (Time Elapsed Between Fragments less than Sixty Seconds)
Host and Router
Common Test Setup 1.1
Verify that a node takes the proper actions when th reassembly time has been exceeded for a packet.
TN NUT
| |
|-------------------------->|
| Echo Request (1st) |
| |
| |
| wait for 55 sec. |
| |
| |
|-------------------------->|
| Echo Request (2nd) |
| |
|-------------------------->|
| Echo Request (3rd) |
| |
|<--------------------------|
| Echo Reply |
| |
| |
v v
1. TN transmits 1st, 2nd and 3rd Fragments in order.
There is a 55-second delay between the transmission of 1st Fragment and 2nd, 3rd Fragments.
2. Observe the packets transmitted by the NUT.
Echo Request Data (original) is:
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0
PayloadLength = 88
NextHeader = 58 (ICMPv6)
SourceAddress = TN Global Address
DestinationAddress = NUT Global Address
ICMP Echo Request
Type = 128 (Echo Request)
Code = 0
Checksum = (auto)
Identifier = (auto)
SequenceNumber = 0
PayloadData = data repeat{0x1, 40}
data repeat{0x2, 40}
Echo Request Data (1st fragment) is:
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0
PayloadLength = 40
NextHeader = 44 (Fragment Header)
SourceAddress = TN Global Address
DestinationAddress = NUT Global Address
Fragment Header
NextHeader = 58 (ICMPv6)
FragmentOffset = 0
MFlag = 1
Identification = 32bit (Automatic generation)
Payload
data = 32 octets from the head of ICMP Echo request
Echo Request Data (2nd fragment) is:
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0
PayloadLength = 40
NextHeader = 44 (Fragment Header)
SourceAddress = TN Global Address
DestinationAddress = NUT Global Address
Fragment Header
NextHeader = 58 (ICMPv6)
FragmentOffset = 4
MFlag = 1
Identification = 32bit (Automatic generation)
Payload
data = 32 octets from the back of ICMP Echo request
Echo Request Data (3rd fragment) is:
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0
PayloadLength = 32
NextHeader = 44 (Fragment Header)
SourceAddress = TN Global Address
DestinationAddress = NUT Global Address
Fragment Header
NextHeader = 58 (ICMPv6)
FragmentOffset = 8
MFlag = 0
Identification = 32bit (Automatic generation)
Payload
data = 24 octets from the back of ICMP Echo request
PASS: 2nd and 3rd Fragments arrive just before the NUT's reassembly timer expires for 1st Fragment.
The NUT must transmit an Echo Reply to TN in response to the reassembled Echo Request.
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0
PayloadLength = 88
NextHeader = 58 (ICMPv6)
SourceAddress = NUT Global Address
Destination Address = TN Global Address
ICMP Echo Reply
Type = 129 (Echo Reply)
Code = 0
Checksum = (auto)
Identifier = (same as Echo Request)
SequenceNumber = (same as Echo Request)
PayloadData = (same as Echo Request)
Common Test Cleanup
perldoc V6evalTool