FL_NonZeroOverRouter - check Flow Label Non-Zero over Router
Router
FL_NonZeroOverRouter.seq [-tooloption ...] -pkt FL_NonZeroOverRouter.def
-tooloption : v6eval tool option
See also IH_Router.def
None
Tester Target Tester
(Link0) (Link1)
| | |
|-------------------------->| |
| Echo Request to Link0 | |
| | |
| |-------------------------->|
| | Neighbor Solicitation |
| | |
| |<--------------------------|
| | Neighbor Advertisement |
| | |
| |-------------------------->|
| | Echo Request from Link1 |
| | |
| | |
| |<--------------------------|
| | Echo Reply to Link1 |
| | |
|<--------------------------| |
| Neighbor Solicitation | |
| | |
|-------------------------->| |
| Neighbor Advertisement | |
| | |
|<--------------------------| |
| Echo Reply from Link0 | |
| | |
v v v
1. Send Echo Request to Link0 2. Wait Echo Reply from Link1 or NS from Link1 3. If NS received then send NA to Link1, and wait Echo Reply form Link1 again 4. Receive Echo Reply from Link1 5. Send Echo Request to Link1 6. Wait Echo Reply from Link0 or NS from Link0 7. If NS received then send NA to Link0, and wait Echo Reply form Link0 again 8. Receive Echo Reply from Link0
Echo Request to Link0 Data is:
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0x34567 (20 bit)
PayloadLength = 16
NextHeader = 58 (ICMP)
SourceAddress = Tester Global Address (Link0)
DestinationAddress = Tester Global Address (Link1)
ICMP Echo Request
Type = 128 (Echo Request)
Code = 0
Checksum = (auto)
Identifier = 0xffff
SequenceNumber = 1
PayloadData = {1,2,3,4,5,6,7,8}
Neighbor Solicitation packet's IP source Address selection may be:
- Link Local Address
- Global Address
This test IS NOT the Neighbor Discovery test, so admit both implementation.
PASS: Echo Reply Received from Link0
IPv6 Header
Version = 6
Traffic Class = 0
FlowLabel = 0x34567 (20 bit)
PayloadLength = 16
NextHeader = 58 (ICMP)
SourceAddress = Tester Global Address (Link1)
DestinationAddress = Tester Global Address (Link0)
ICMP Echo Reply
Type = 129 (Echo Reply)
Code = 0
Checksum = (auto)
Identifier = 0xffff (same as Echo Request)
SequenceNumber = 1 (same as Echo Request)
PayloadData = {1,2,3,4,5,6,7,8} (same as Echo Request)
RFC2460
3. IPv6 Header Format
Flow Label 20-bit flow label. See section 6.
6. Flow Labels
The 20-bit Flow Label field in the IPv6 header may be used by a source to label sequences of packets for which it requests special handling by the IPv6 routers, such as non-default quality of service or "real-time" service. This aspect of IPv6 is, at the time of writing, still experimental and subject to change as the requirements for flow support in the Internet become clearer. Hosts or routers that do not support the functions of the Flow Label field are required to set the field to zero when originating a packet, pass the field on unchanged when forwarding a packet, and ignore the field when receiving a packet.
perldoc V6evalTool