Hi, all
I have a guestion about IPv6 CORE Protocol's implementation.
CORE Protocol Interop TEST IP6Interop1.4
1. Configure TAR-Router1 to transmit Router Advertisements with Router Lifetimes equal to 0 and
at a normal interval on Network1, and Router Lifetimes greater than the Router Advertisement
Interval on Network2.
2. Transmit an ICMPv6 Echo Request from REF-Host2 to the Global Address of TAR-Host1.
3. Observe the packets sent on Network1 and Netwokk2
4. .....
Observable Results:
Step 3: TAR-Host1 MUST not transmit an Echo Reply using TAR-Router1 as its first hop or
transmit a multicast NS with a target address set to TR1's link-local address.
and Step 9 is same.
Our test result is differnt. Our result is blow.
Step 3 and Step 9
TAR-Host1(Our TARGET) dosen't transmit an Echo Reply using TAR-Router1 as its first hop.
But TAR-Host1 transmit a multicast NS with a target address set to REF-Host2's Global Address.
^^^^^^^^^^^^^^^^^^^^^^^^^^^
When our target receive RA with Router Lifetime equal to 0
Step1 : Keep Default Router List empty
Step7 : Delete Defulat Router List entry which is created in Step4.
So, Default Router List becomes empty.
Then Step2 or Step8, when our target receive ICMPv6 Echo Request from REF-Host2,
our target operate "next-hop determination" to send ICMPv6 Echo Reply.
Accorging to RFC2461
---------------------------------------------------------------------------
5.2 Conceptual Sending Algorithm
Next-hop determination for a given unicast destination operates as
follows. The sender performs a longest prefix match against the
Prefix List to determine whether the packet's destination is on- or
off-link. If the destination is on-link, the next-hop address is the
same as the packet's destination address. Otherwise, the sender
selects a router from the Default Router List (following the rules
described in Section 6.3.6). If the Default Router List is empty,
the sender assumes that the destination is on-link.
----------------------------------------------------------------------------
In Step2 or Step8, Default Router List is empty. So, our target think that the
destination(REF-Host2) is on-link. Then our target operate "7.2 Address Resolution"
"7.2.2 Sending Neighor Solicitations".
So, our target send a multicast NS with a target address set to REF-Host2' Global Address.
Is such implemantation is correct or not?
And if our implementation is not correct, where is wrong ?
( I don't understand why it is correct to transmit a multicast NS (TR1's link-local address)
or not to transmit any packet.)
Regars,
Otoshi
[Wed, 27 Feb 2008 11:03:49 +0900]
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