P_Problem_Link-Local.seq - check Parameter Problem (link-local address)
Host/Router
When test starts, states of Neighbor Cache Entry for TN's
addresses are reachable.
This test verifies that NUT send valid ICMPv6 Parameter Problem (code 1)
in response to a packet include unknown next header field value.
And this test verifies that the message processing rule ,
If the message is a response to a message sent to one of the
node's unicast addresses, the Source Address of the reply must
be that same address.
TN NUT
---------------------------
1.
=== IPv6 packet ===>
src address : TN link local address
dst address : NUT link local address
next header is not used in NUT
2.
<< JUDGMENT >>
<=== ICMPv6 Prameter Problem ===
src address : NUT link local address
dst address : TN link local address
Code is 1
Pointer is 40
<< PASS >>
NUT send ICMPv6 ICMPv6 Parameter Problem.
<< FAIL >>
NUT do not send ICMPv6 Parameter Problem.
RFC2463 3.4 Parameter Problem Message
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Pointer |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| As much of invoking packet |
+ as will fit without the ICMPv6 packet +
| exceeding the minimum IPv6 MTU [IPv6] |
IPv6 Fields:
Destination Address
Copied from the Source Address field of the invoking packet.
ICMPv6 Fields:
Type 4
Code 0 - erroneous header field encountered
1 - unrecognized Next Header type encountered
2 - unrecognized IPv6 option encountered
Pointer Identifies the octet offset within the
invoking packet where the error was detected.
The pointer will point beyond the end of the ICMPv6
packet if the field in error is beyond what can fit
in the maximum size of an ICMPv6 error message.
Description
If an IPv6 node processing a packet finds a problem with a field in the IPv6 header or extension headers such that it cannot complete processing the packet, it MUST discard the packet and SHOULD send an ICMPv6 Parameter Problem message to the packet's source, indicating the type and location of the problem.
The pointer identifies the octet of the original packet's header where the error was detected. For example, an ICMPv6 message with Type field = 4, Code field = 1, and Pointer field = 40 would indicate that the IPv6 extension header following the IPv6 header of the original packet holds an unrecognized Next Header field value.
perldoc V6evalTool