> In today's Internet, uRPF can be deployed to eliminate such attacks (address
> spoofing).


[Back to where we started?]

We can also do so with IPv6.  And ILNP.

 
> Sorry, let me clarify my thought. Even if the initiator is a forgery (i.e., it
> impersonates other host), how could the responder distinguish whether it is a
> forgery or not?


A priori, he cannot, just as is the situation today.

Tony


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