Le 06/02/2013 21:54, Roland Bless a écrit :
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Hi Michael,
On 06.02.2013 19:23, Michael Richardson wrote:
"TM" == TM <Bless> writes:
RFC4291 is clear that packets destined to ff01::/16 must never
leave the local node, but what should be done if such packets
are received as a result from a broken implementation on the
other side?
TM> "Be liberal in what you accept, and conservative in what you
TM> send", Since the sending node obviously violated the 2nd part
of TM> Jon Postel's robustness principle, it should be ignored and
TM> dropped by the receiving system. Moreover, report the failure
The key is that the packets should be dropped without generating
any errors or traffic.
Yep, you are right - I assumed that implicitly, but I should have
mentioned that explicitly :-)
Also, the implementation of that dropping may not be that
straightforward as at a quick first sight.
A stack presented with a packet whose dst's leftmost 16bits precisely
match ff01::/16 should be dropped _only_ if the src of that packet is an
address which does not belong to that stack (in other words don't
discard packets originated by stack and addressed to self). ('be liberal
in what you accept').
A question could be raised about what should do a stack when presented
with a packet whose src==:: (unspecified address) and dst==ff01::/16
Should it drop it? Log an error? Accept it?
Alex
Regards, Roland
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