[openib-general] IPoIB and lid change

[Eitan Zahavi]

Hi 

The issue with IPoIB address change is not just LID change but also QP
change.
(IPoIB define the MAC to be QP,GID) .

Anytime you do ifconfig down/up you might get a new QP and thus you need
to refresh the ARP...

I second Mike K. and propose we use gratuitous ARP reply whenever an
IPoIB interface is brought up.
 
> I wonder if this is why when I reload the IB drivers on one node
> I sometimes have to reload them on other nodes too. Otherwise
> ping over IPoIB doesn't work.
> 
> > The remote LID may get changed for other reasons too without an SM
> > change (SM merge of 2 separate subnets). How can this be handled ?
> 
> Isn't this just another case of the SM changing for one of the
subnets?
> 
> grant
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