[openib-general] IPv6 All Router Multicast Group

[Hal Rosenstock]

Roland Dreier wrote:
> IPoIB does a send only join when it gets a multicast packet to send.

and this packet is directed at a group which is not currently joined.

> It will do a full member join when the kernel asks it to add a
> multicast group to the list of groups to receive from.

My question was a little unclear; I meant:
Why does the kernel not request a full join 
in the case of the all routers and IGMP groups ?
What is the differentiator for this ?

-- Hal