Jari,

> [...]
> 
> >
> >   Sharing the same link-local address on different MAGs would
> >   require all MAGs of a PMIPv6 domain to construct the CGA and the
> >   RSA Signature option with the same public-private key pair, which
> >   is not acceptable from a security point of view.
> >
> 
> AFAIK there is no requirement that routers construct CGAs.

If the router does not construct a CGA it will not be able to send secure 
Neighbor Advertisement messages for its own address, as per RFC3971: 

   Neighbor Solicitation and Advertisement messages without the CGA
   option MUST be treated as unsecured

Since the router does need to send Neighbor Advertisements for its own address 
whenever a host on the link initiates Neighbor Unreachability Detection, it 
seems to me that there is indeed a requirement that a router constructs a CGA 
as per RFC3971. I am missing something?

--julien
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