Prabhu Hariharan wrote:
Hi,
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.
Without the presence of link-local address on interface, whether any
functionality or IPv6 conformance issue would arise?
From a conformance perspective I think the specs are clear that all
IPv6 interfaces must be assigned a link-local address.
From the practical perspective of "what would break" we have:
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?
I suspect that you also can't use DHCPv6 for non-addresses (finding the
DNS servers etc) since DHCPv6 might assume that some communication uses
the link-local address. But I haven't checked in the RFC.
Erik
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