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Re: ND-proxy applicability and loop-prevention

I agree with Erik and Hesham that loop preventation
is something that we may wish to have. A couple of
comments on what Pekka wrote about detection:

> I think it would be possible to detect loops if we wanted really hard 
> to do that.  That might just lead to reinvention of the spanning tree 
> protocol, though.

This is a danger, yes.

> For example, the ND proxy could send in ND solicitation for its own IP
> address.  If it hears back that solicitation on some other interface,
> it can conclude that someone is looping those packets and it should
> e.g. shut down completely.

Right. Or add an ND option to a proxied query, and detect when you
receive an option which you inserted by yourself.


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