[openib-general] IPv6oIB neighbour discover broken when MCGs overflow

[Shirley Ma]

Roland Dreier <rdreier at cisco.com> wrote on 02/16/2007 09:49:24 AM:

>  > For the successful join, ND sends to the node directly, for the
failure
>  > join, ND sends to all hosts addr. So ND will work no matter whether
the
>  > join OK or not, that's the patch does.
>
> But what if the full-member join fails on node A for node A's
> solicited node group, but then node B succeeds in joining that group
> as a send-only member (perhaps because some other nodes have dropped
> off the fabric in the meantime).  Then node B will send the ND message
> on a MCG that A is not a member of.
>
>  - R.

Yes. B can send ND to A, and A responds without being a member so IPv6 ND
works. Is there any security or other problems here?

Thanks
Shirley Ma
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