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SubjectRe: IPv6 multicast forwarding
On Fri, 24 Oct 2008, Alejandro Riveira Fernández wrote:
>> Let me apologize in advance for the length of this message - it is long!
>>
>> I'm trying to test out IPv6 multicast forwarding on a 2.6.26 kernel
>> and I'm getting some strange values for the upcall messages from the
>> kernel. My code is below, but to give an overview, my setup is as
>> follows:
>>
>> sender ------ ff15::1 -----> [eth1] linux 2.6.26 [eth0] ------> ...

Maybe this isn't the bug you're looking for but you shouldn't be using
ff1x multicast addresses in a test like this; ff1x means that the
multicast group is of "interface-local scope" and it isn't useful for
multicast forwarding. So the kernel might be correct in not
installing multicast forwarding state for a group address like this
(but if it's a conscious decision, maybe the failure mode should be
better). See S 2.7 of RFC4291.

--
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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