Re: Is Link-Local address mandatory for a host device?

[Francis Dupont <Francis.Dupont at fdupont.fr>]

 In your previous mail you wrote:

   For a end-device (a host), if the interface connecting to IPv6 network is
   configured with IPv6 global address, then automatic configuration of
   link-local address is mandatory for that interface?  Consider the host is
   being statically configured with IPv6 default gateway address.
   
=> as far as I know at the exception of some very specific link types
the configuration of a link-local address per link is mandatory
(note I didn't add "automatic"). BTW a default gateway address is
supposed to be link-local.

   Without the presence of link-local address on interface, whether any
   functionality or IPv6 conformance issue would arise?
   
=> some packets on the link are required to use a link-local address.

   So, for DAD it would use unspecified address (::) as source address, for
   Address resolution it would use the IPv6 global address, no need of router
   discovery / prefix discovery in this host and applications would use global
   address.  In this case, presence of link-local address is necessary?
   
=> DAD is per address (cf the DAD vs DIID debate).

Regards

Francis.Dupont at fdupont.fr