F_Reassembly_1500 - Fragment Reassembly (Reassemble to 1500)
Host and Router
None
Verify that a node correctly reassembles fragmented packets and distinguishes between packet fragments using the Source Address, Destination Address and Fragment ID.
TN NUT
| |
|-------------------------->|
| Echo Request |
| |
|<--------------------------|
| Echo Reply |
| |
|-------------------------->|
| Echo Request (1st) |
| |
|-------------------------->|
| Echo Request (2nd) |
| |
|-------------------------->|
| Echo Request (3rd) |
| |
|<--------------------------|
| Echo Reply |
| |
| |
v v
1. TN transmits an Echo Request to the NUT. TN answers any NS with a NA.
2. Observe the packets transmitted by the NUT.
3. TN transmits 1st, 2nd and 3rd Fragments in order.
All fragments have the same Source Address, Destination Address, and Fragment ID,
however, the payloads of each fragment are modified so that the reassembled packet size is 1500.
4. Observe the packets transmitted by the NUT.
Echo Request Data (original) is:
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0
PayloadLength = 1460
NextHeader = 58 (ICMPv6)
SourceAddress = TN Link Local Address
DestinationAddress = NUT Link Local Address
ICMP Echo Request
Type = 128 (Echo Request)
Code = 0
Checksum = (auto)
Identifier = (auto)
SequenceNumber = 0
PayloadData = data repeat{0x1, 512}
data repeat{0x2, 512}
data repeat{0x3, 428}
Echo Request Data (1st fragment) is:
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0
PayloadLength = 520
NextHeader = 44 (Fragment Header)
SourceAddress = TN Link Local Address
DestinationAddress = NUT Link Local Address
Fragment Header
NextHeader = 58 (ICMPv6)
FragmentOffset = 0
MFlag = 1
Identification = 32bit (Automatic generation)
Payload
data = 520 octets from the head of ICMP Echo request
Echo Request Data (2nd fragment) is:
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0
PayloadLength = 520
NextHeader = 44 (Fragment Header)
SourceAddress = TN Link Local Address
DestinationAddress = NUT Link Local Address
Fragment Header
NextHeader = 58 (ICMPv6)
FragmentOffset = 65
MFlag = 1
Identification = 32bit (Automatic generation)
Payload
data = 520 octets from the back of ICMP Echo request
Echo Request Data (3rd fragment) is:
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0
PayloadLength = 420
NextHeader = 44 (Fragment Header)
SourceAddress = TN Link Local Address
DestinationAddress = NUT Link Local Address
Fragment Header
NextHeader = 58 (ICMPv6)
FragmentOffset = 130
MFlag = 0
Identification = 32bit (Automatic generation)
Payload
data = 420 octets from the back of ICMP Echo request
PASS: The NUT must respond to the Echo Request from TN in Step 2.
The NUT must respind to the Echo Request from TN in Step 4 (see below).
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0
PayloadLength = 1460
NextHeader = 58 (ICMPv6)
SourceAddress = NUT Link Local Address
Destination Address = TN Link Local 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