Re: [DNA] Comment on draft-jinchoi-dna-goals-00

[JinHyeock Choi <athene@sait.samsung.co.kr>]

[omitted]
> > > >1) Link local scope of Router Address  
> > > >So if it happens that two different router interfaces have the 
> > > >same link-local address, a host can't detect that it has 
> > > >moved from one interface to another by checking the router 
> > > >address in Router Advertisement messages. 
> > > 
> > > I don't think above case is a real model, why two different router
> > > interfaces are used with the same MAC ? did you have any 
> > > experience on that ?
> > 
> > Link-local not link-layer. 
> 
> Um... same link-local address is generated from same MAC if they 
> make use of EUI-64 format described in 2462. I am not sure it is a 
> problem for DNA. Seems like a network mis-configuration by
> administrator...
> Am I missing anything ? 

The same link-local address doesn't imply the same link-layer address. 
The inverse doesn't hold either.  Neither necessary nor sufficient condition 
among them.  

A few people informed us that it's rather common practice to assign the 
same link-local address to the multiple interfaces of a router. 
 
Alper commented on it and I've heard that, at MoonV6, Cisco had assigned 
the same link-local scope address fe80::1 to all of its router interfaces. 
 
Best Regards

JinHyeock Choi