On Wed, Mar 21, 2012 at 12:57 PM, Worley, Dale R (Dale)
<dworley(_at_)avaya(_dot_)com> wrote:
From: Craig Finseth [snark17(_at_)gmail(_dot_)com]
You've just rediscovered what the "link local" part of the link-local
address means: the address is local to the link! It is not globally
unique or even unique within a host, it is just unique within a link.
Actually, it's globally *unique*, because it contains the MAC address.
The problem is that it's not *routable*, even within the context of a
single host. And unless you give an application on the host guidance,
it depends on host-context routing to get its output packets to the
correct wire. It's hard to remain aware that host-context routing is
important, because it's almost always work.
Well, it's globally unique to a host, not to an interface: the host
(in general) uses the same link-local address on all interfaces.
Thus, you can't tell from the address which interface it refers to.
--
Craig A. Finseth